diff --git a/a1/prog b/a1/prog
index 521b61e..d3fd74c 100755
Binary files a/a1/prog and b/a1/prog differ
diff --git a/a1/program.c b/a1/program.c
index 89ffff5..692c25f 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -4,99 +4,68 @@
 
 #define MAX_SIZE 1000
 
-int is_valid_brackets(const char* s, int* err) {
-    char stack[MAX_SIZE];
-    int top = -1;
-
-    for (int i = 0; s[i] != '\0'; i++) {
-        char c = s[i];
-        if (c == '(' || c == '[' || c == '{' || c == '<') {
-            if (top < MAX_SIZE - 1) {
-                stack[++top] = c;
-            } else {
-                *err = i +1;
-                return 0;
-            }
-        }
-        else if (c == ')' || c == ']' || c == '}' || c == '>') {
-            if (top == -1) {
-                *err = i +1;
-                return 0;
-            }
-            char last = stack[top--];
-            if ((c == ')' && last != '(') ||
-                (c == ']' && last != '[') ||
-                (c == '}' && last != '{') ||
-                (c == '>' && last != '<')) {
-                *err = i+1;
-                return 0;
-            }
-        }
-    }
-    if (top != -1) {
-        // Знаходимо позицію незакритої дужки
-        char lastOpen = stack[top];
-        for (int i = 0; s[i] != '\0'; i++) {
-            if (s[i] == lastOpen) {
-                *err = i  +1;
-                return 0;
-            }
-        }
-    }
-    return 1;
-}
-
-
 char getExpectedClosing(char open) {
     switch (open) {
         case '(': return ')';
         case '[': return ']';
         case '{': return '}';
         case '<': return '>';
-        default: return '?'; 
+        default: return '?';
     }
 }
+
+bool isOpening(char c) {
+    return c == '(' || c == '[' || c == '{' || c == '<';
+}
+
+bool isClosing(char c) {
+    return c == ')' || c == ']' || c == '}' || c == '>';
+}
+
+char getExpectedOpening(char close) {
+    switch (close) {
+        case ')': return '(';
+        case ']': return '[';
+        case '}': return '{';
+        case '>': return '<';
+        default: return '?';
+    }
+}
+
 int main() {
     char input[MAX_SIZE];
-
     if (fgets(input, MAX_SIZE, stdin) != NULL) {
         input[strcspn(input, "\n")] = '\0';
         printf("Read: %s\n", input);
 
-        int err = 0;
-        if (is_valid_brackets(input, &err)) {
-            printf("All brackets OK\n");
+        char stack[MAX_SIZE];
+        int top = -1;
+
+        for (int i = 0; input[i] != '\0'; i++) {
+            char c = input[i];
+            if (isOpening(c)) {
+                stack[++top] = c;
+            } else if (isClosing(c)) {
+                if (top == -1) {
+                    printf("Unexpected closing bracket %c in %d\n", c, i);
+                    return 0;
+                }
+                char last = stack[top--];
+                if (getExpectedClosing(last) != c) {
+                    printf("Crossed bracket %c in %d, expected %c \n", c, i , getExpectedClosing(last));
+                    return 0;
+                }
+            }
+        }
+
+        if (top != -1) {
+            printf("Missing closing brackets: ");
+            for (int i = top; i >= 0; i--) {
+                printf("%c", getExpectedClosing(stack[i]));
+            }
+            printf("\n");
         } else {
-            char stack[MAX_SIZE];
-            int top = -1;
-
-            for (int i = 0; i < err; i++) {
-                char c = input[i];
-                if (c == '(' || c == '[' || c == '{' || c == '<') {
-                    stack[++top] = c;
-                } else if (c == ')' || c == ']' || c == '}' || c == '>') {
-                    if (top >= 0 && c == getExpectedClosing(stack[top])) {
-                        top--;
-                    } else {
-                        printf("Crossed bracket %c in %d, expected %c\n",
-                               c, err, (top >= 0) ? getExpectedClosing(stack[top]) : '?');
-                        return 0;
-                    }
-                }
-            }
-
-            char c = input[err - 1];
-            if (c == ')' || c == ']' || c == '}' || c == '>') {
-                if (top < -1) {
-                    printf("Unexpected closing bracket %c in %d\n", c, err);
-                }
-            } else {
-                printf("Missing closing brackets: ");
-                for (int i = top; i > -1; i--) {
-                    printf("%c", getExpectedClosing(stack[i]));
-                }
-                printf("\n");
-            }
+            printf("All brackets OK\n");
         }
     } else {
         printf("Error reading input\n");