#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int c = 0;
  if (s.length() < 3) {
    cout << "NO";
    return 0;
  }
  for (long long i = 0; i < s.length() - 2; i++) {
    if (s[i] != s[i + 1] && s[i] != '.' && s[i + 1] != '.' &&
        s[i + 1] != s[i + 2] && s[i + 2] != '.' && s[i] != s[i + 2]) {
      cout << "YES";
      return 0;
    }
  }
  cout << "NO";
  return 0;
}
