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

#define MAX_LEN 100

int isOpening(char c){
	return (c == '(' || c == '[' || c == '{' || c == '<');
}

int isClosing(char c){
	return (c == ')' || c == ']' || c == '}' || c == '>');
}

char expectedClosing(char c){
	switch (c) {
		case '(': return ')';
		case '[': return ']';
		case '{': return '}';
		case '<': return '>';
		default: return '?';
	}
}

char expectedOpening(char c){
	switch (c) {
		case ')': return '(';
		case ']': return '[';
		case '}': return '{';
		case '>': return '<';
		default: return '?';
	}
}


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

	if (!fgets(code, sizeof(code), stdin)){
		printf("Input error\n");
		return 1;
	}

	code[strcspn(code, "\n")] = '\0';

	printf("Read: %s\n", code);

	int len = strlen(code);
	for (int i = 0; i < len; i++){
		char c = code[i];

		if (isOpening(c)){
			if (top < MAX_LEN - 1){
				stack[++top] = c;
			}
		}
		else if (isClosing(c)){
			if (top < 0){
				printf("Unexpected closing bracket %c in %d\n", c, i);
				return 0;
			}
			char last = stack[top--];
			if (expectedClosing(last) != c){
				printf("Crossed bracket %c in %d, expected %c \n", c, i, expectedClosing(last));
				return 0;
			}
		}
	}
	if (top >= 0){
		printf("Missing closing brackets: ");
		while (top >= 0) {
			printf("%c", expectedClosing(stack[top--]));
		}
		printf("\n");
	} else {
		printf("All brackets OK\n");
	}

	return 0;
}