diff --git a/a1/program.c b/a1/program.c
index da77052..b5bd415 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -1,8 +1,44 @@
 #include <stdio.h>
 #include <string.h>
-#include <stdlib.h>
-#include <ctype.h>
 
-int main(){
+#define LINESIZE 100
+
+int main() {
+    char vstup[LINESIZE];
+    char *brackets = "{[(<";
+    char *brackets1 = "}])>";
+    char stack[LINESIZE];    
+    int position[LINESIZE];    
+    int x = 0;                 
+    fgets(vstup, LINESIZE, stdin);
+    for (int j = 0; j < strlen(vstup); j++) {
+        for (int i = 0; i < 4; i++) {
+            if (vstup[j] == brackets[i]) {
+                stack[x] = brackets[i];  
+                position[x] = j;           
+                x++;
+                break;
+            } else if (vstup[j] == brackets1[i]) {
+                char expected;
+                if (stack[x-1] == '{') expected = '}';
+                else if (stack[x-1] == '[') expected = ']';
+                else if (stack[x-1] == '(') expected = ')';
+                else if (stack[x-1] == '<') expected = '>';
+
+                if (vstup[j] != expected) {
+                    printf("Crossed bracket %c in %d, expected %c\n", vstup[j], j, expected);
+                    return 0;
+                }
+                x--;
+                break;
+            }
+        }
+    }
+    if (x > 0) {
+        printf("Unmatched opening bracket %c at position %d\n", stack[x-1], position[x-1]);
+    } else {
+        printf("All brackets OK\n");
+    }
+
     return 0;
 }
\ No newline at end of file