#include <stdio.h>
#include <stdlib.h>
char checkCharacter(char character);
int numberOfBrackets = 0;
int main()
{
    printf("0");
    char character ="";
    while(character!=EOF)
    {
        character = getchar();
        checkCharacter(character);
    }
    return 0;
}

char checkCharacter(char character)
{
    if(character == '{')
    {
        numberOfBrackets++;
    }
    if(character == '}')
    {
        numberOfBrackets--;
    }
    if(character == '\n')
    {
    }
    if(character != '\n'||character != '}'|| character != '{')
    {
        putchar(character);
    }
}