#include <stdio.h>
#include <string.h>

#define MAX_LEN 100

typedef struct {
    char bracket;
    int position;
} StackItem;

int main() {
    char line[MAX_LEN + 1];
    StackItem stack[MAX_LEN];
    int top = -1; 

    fgets(line, sizeof(line), stdin);

    printf("Read: %s", line);

    for (int i = 0; line[i] != '\0'; i++) {
        char ch = line[i];

        if (ch == '(' || ch == '{' || ch == '[' || ch == '<') {
            if (top < MAX_LEN - 1) {
                stack[++top].bracket = ch;
                stack[top].position = i;
            }
        }
        else if (ch == ')' || ch == '}' || ch == ']' || ch == '>') {
            if (top == -1) {
    
                return 0;
            }

            char opening = stack[top].bracket;
            int opening_pos = stack[top].position;
            top--;

            if ((opening == '(' && ch != ')') ||
                (opening == '{' && ch != '}') ||
                (opening == '[' && ch != ']') ||
                (opening == '<' && ch != '>')) {
                char expected;
                switch (opening) {
                    case '(': expected = ')'; break;
                    case '{': expected = '}'; break;
                    case '[': expected = ']'; break;
                    case '<': expected = '>'; break;
                }
                printf("Crossed bracket %c in %d, expected %c\n", ch, i, expected);
                return 0;
            }
        }
    }

    if (top != -1) {
        printf("Unmatched opening bracket %c at position %d\n", stack[top].bracket, stack[top].position);
    } else {
        printf("All brackets OK\n");
    }

    return 0;
}