#include <stdio.h>

int main(void)
{
  char S[21] = {0};
  char NickName[4] = {0};
  int i = 0;
  
  scanf("%s", S);
  for( i = 0; i < sizeof(NickName) - 1; i++ ) {
    NickName[i] = S[i];
  }
  printf("%s", NickName);
}