#include <stdio.h>

main() {
  int car;
  car = 1;
  
  while ((car = fgetc (stdin)) != EOF) {
    if (car != 0x20)
      putc (car, stdout);
    else {
      putc (0x09, stdout); 
      while ((car = fgetc (stdin)) == 0x20);
      ungetc (car, stdin);
    }
  }
}