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

#define MAX_SIZE 1000

char getExpectedClosing(char open) {
    switch (open) {
        case '(': return ')';
        case '[': return ']';
        case '{': return '}';
        case '<': 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);

        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 {
            printf("All brackets OK\n");
        }
    } else {
        printf("Error reading input\n");
    }

    return 0;
}