#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll= long long;
using ull=unsigned long long;
using ldo =long double;
#define rep(i,n,k) for(ll i = k; i < (ll)(n); i++)
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
const ll INF = 1e18;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;

int main() {
  string S;
  cin>>S;
  bool x=false,y=false;
  int a[300];
  rep(i,300,0)a[i]=0;
  rep(i,3,0){
    a[(int)S[i]]+=1;
  }
  rep(i,300,0){
    if(a[i]==1)x=true;
    if(a[i]==2)y=true;
  }
  if(x and y)cout<<"Yes"<<endl;
  else cout<<"No"<<endl;
}