diff --git a/a1/program.c b/a1/program.c
index e69de29..3d17de4 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <string.h>
+
+int open_brackets(char a) {
+    return (a == '(' || a == '[' || a == '{' || a == '<');
+}
+
+int close_brackets(char a) {
+    return (a == ')' || a == ']' || a == '}' || a == '>');
+}
+
+char brackets(char a) {
+    switch (a) {
+        case ')':
+            return '(';
+        case ']':
+            return '[';
+        case '}':
+            return '{';
+        case '>':
+            return '<';
+        default:
+            return '\0';
+    }
+}
+
+int main() {
+    char code[100];
+    printf("Read: ");
+    fgets(code, sizeof(code), stdin);
+
+    int stack[100];
+    int skobochka = -1;
+    int error = -1;
+
+    for (int i = 0; code[i] != '\0'; i++) {
+        if (open_brackets(code[i])) {
+            stack[++skobochka] = i;
+        } else if (close_brackets(code[i])) {
+            if (skobochka == -1) {
+                error = i;
+                break;
+            }
+            if (code[stack[skobochka]] != brackets(code[i])) {
+                error = i;
+                break;
+            }
+            skobochka--;
+        }
+    }
+
+    if (error == -1 && skobochka == -1) {
+        printf("All brackets OK\n");
+    } else if (error == -1) {
+        printf("Crossed bracket %d expected\n", stack[skobochka]);
+    } else {
+        printf("Prekrížené zátvorky %c v pozícii %d, sa očakávalo %c\n", code[error], error, brackets(code[error]));
+    }
+    return 0;
+}