diff --git a/a1/prog b/a1/prog
new file mode 100755
index 0000000..98ec133
Binary files /dev/null and b/a1/prog differ
diff --git a/a1/program.c b/a1/program.c
new file mode 100644
index 0000000..c31ca05
--- /dev/null
+++ b/a1/program.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+
+#define MAX_SIZE 1000
+
+bool 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 == '{') {
+            if (top < MAX_SIZE - 1) {
+                stack[++top] = c;
+            } else {
+                *err= i + 1; 
+                return false;
+            }
+        }
+        else if (c == ')' || c == ']' || c == '}') {
+            if (top == -1) {
+                *err= i + 1;
+                return false;
+            }
+            char last = stack[top--]; 
+            if ((c == ')' && last != '(') ||
+                (c == ']' && last != '[') ||
+                (c == '}' && last != '{')) {
+                *err
+     = i + 1; 
+                return false;
+            }
+        }
+    }
+    if (top != -1) {
+        *err = strlen(s) + 1; 
+        return false;
+    }
+    return true; 
+}
+
+int main() {
+    char input[MAX_SIZE];
+    
+    if (fgets(input, MAX_SIZE, stdin) != NULL) {
+        input[strcspn(input, "\n")] = '\0';
+        
+        int err = 0;
+        if (is_valid_brackets(input, &err)) {
+            printf("True\n");
+        } else {
+            printf("False at position %d\n", err
+);
+        }
+    }
+    
+    return 0;
+}
+