2 1
1 1
 4 1
2 2 1 1
 10 1
2 6 3 4 2 4 4 3 2 1
 2 1
999152 999153
 8 1000000
1 1 5 1000000 1000000 2 2 2
 9 2
1 6 1 5 5 8 6 8 7
 15 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
 1 4
8
 10 1
6 3 1 3 6 4 1 3 6 4
 10 1
1 2 3 5 6 8 10 11 9 4
 7 2
1 5 5 8 9 8 8
 2 1000000
1 1000000
 8 2
3 13 9 8 3 13 9 14
 1 1
1
 2 1
1 2

2
 2
 4
 1
 2
 4
 15
 1
 7
 2
 4
 1
 5
 1
 1

#include <bits/stdc++.h>
using namespace std;
const long long INF = 1e9;
const long long N = 1e5 + 1;
const long long mod = 1e9 + 7;
const long double eps = 1E-7;
string s;
int main() {
  ios_base::sync_with_stdio(0);
  cin >> s;
  for (int i = 0; i < int(s.size()) - 2; i++) {
    string t = "";
    for (int j = 0; j < 3; j++) t += s[i + j];
    sort(t.begin(), t.end());
    if (t == "ABC") {
      cout << "Yes";
      return 0;
    }
  }
  cout << "No";
}
