Triplet Numbers - X99068

#include <iostream>
using namespace std;

//pre: 0 < n and n < 10^9
//post: returns true if n is a triplets-number and false otherwise
bool triplet_number(int n){
  if (n < 100) return false;
  else if (n < 1000) {
    int x = n % 10;
    int y = (n / 10) % 10;
    int z = (n / 100) % 10;
    return x == y and y == z;
  }
  else return triplet_number(n / 1000) and (triplet_number(n % 1000) or n%1000 == 0);
}

int main(){
  int n;
  while (cin >> n){
    if (triplet_number(n)) cout << "TRUE" << endl;
    else cout << "FALSE" << endl;
  }
}