#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <ctype.h>
//// @ 
#define STACK_SIZE 200

struct Stack
{
   char values[STACK_SIZE];
   int size;
};

void push_stack(struct Stack* stack, char value)
{
    assert(stack->size < STACK_SIZE); 
    stack->values[stack->size] = value;
    stack->size += 1;
}
char pop_stack(struct Stack* stack)
{
    assert(stack->size > 0); 
    char value = stack->values[stack->size-1];
    stack->size -= 1;
    return value;
}
int count_stack(struct Stack* stack)
{
  return stack->size;
}

void print_stack(struct Stack* stack)
{
    for (int i=0; i<stack->size; i++)
    {
        printf("%c ", stack->values[i]);
    }
    printf("\n");
}

char para(char c)
{
    if(c=='(') return ')';
    if(c=='<') return '>';
    if(c=='{') return '}';
    if(c=='[') return ']';

    if(c==')') return '(';
    if(c=='>') return '<';
    if(c=='}') return '{';
    if(c==']') return '[';
}

int main()
{
    struct Stack mystack;
    mystack.size=0;

    char str[128];
    scanf("%s", str);
    printf("Read: %s", str);

    int i=0;
    char c, cs;
    while(str[i]!='\0')
    {
        c=str[i];
        if(c=='<'||c=='('||c=='{'||c=='[')
        {
           push_stack(&mystack, c); 
        }
        if(c=='>')
        {
            cs=pop_stack(&mystack);
            if(cs!='<')
            {
                printf("Crossed bracket %c in %d, expected %c", c, i);
            }
        }

    }


//Crossed bracket > in 12, expected )

      
	return 0;
}