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

/* Let's assume we got a C99-compliant compiler */
#include <stdbool.h>

#define MAXLENGH 20000

bool caractere_de_debut(char c) {
  return (c == '\t') || (c == ' ');
}

int accolades(char chaine[]) {
  int cpt = 0;
  int i;

  for(i=0; chaine[i] != '\0'; i++)
    if(chaine[i] == '{')
      cpt++;
    else if(chaine[i] == '}')
      cpt--;

  return cpt;
}

void enleverpremiersespaces(char chaine[]) {
  int i = 0;
  int j;
  int lengh = strlen(chaine) + 1;

  while(caractere_de_debut(chaine[i]))
    i++;

  for(j=i; j <= lengh; j++)
      chaine[j-i] = chaine[j];
}

void ecritpremiersespaces(char chaine[], int m) {
  char chaine2[MAXLENGH];
  int i;
  int max = strlen(chaine);

  enleverpremiersespaces(chaine);
  strcpy(chaine2, chaine);

  if(MAXLENGH>=(max+m)) {
    for(i=0; i<m; i++)
      chaine[i] = ' ';
    chaine[m] = '\0';
    strcat(chaine,chaine2);
  }
}

int main() {
  int nbraclds = 0;
  char chaine[MAXLENGH];

  while(fgets(chaine, MAXLENGH, stdin) != NULL) {
      if(accolades(chaine) > 0) {
    ecritpremiersespaces(chaine, (nbraclds*4));
    nbraclds += accolades(chaine);
      } else {
    nbraclds += accolades(chaine);
    ecritpremiersespaces(chaine, (nbraclds*4));
      }
    printf("%s", chaine);
  }

  printf("\n");
}