#include <stdio.h>
#define MAX 100

void serch_zatv(char vhod[MAX]) {
    char first[2] = "{}";
    char second[2] = "[]";
    char third[2] = "<>";
    char fourth[2] = "()";
    int idx = 0;
    int idt = 0;
    char find[50] = {0};
    
    while (vhod[idx] != '\0') {
        if (vhod[idx] == first[0]) {
            find[idt] = first[1];
            idt++;
        } else if (vhod[idx] == second[0]) {
            find[idt] = second[1];
            idt++;
        } else if (vhod[idx] == third[0]) {
            find[idt] = third[1];
            idt++;
        } else if (vhod[idx] == fourth[0]) {
            find[idt] = fourth[1];
            idt++;
        } else {
            for (int i = 0; i < idt; i++) {
                if (vhod[idx] == find[i]) {
                    find[i] = '.';
                    for (int r = i + 1; r < idt; r++) {
                        if (find[r] != '.' && find[r] != '\0') {
                            printf("Crossed bracket %c at position %d, expected %c\n", vhod[idx], idx, find[i]);
                            return;
                        }
                    }
                    break;
                }
            }
        }
        idx++;
    }
    
    for (int i = 0; i < idt; i++) {
        if (find[i] != '.' && find[i] != '\0') {
            printf("Unmatched bracket\n");
            return;
        }
    }
    
    printf("All brackets OK\n");
}

int main() {
    char riadok[MAX];
    scanf("%s", riadok);  // Без амперсанда &

    serch_zatv(riadok);

    return 0;
}