#ifdef __LOCAL #define _GLIBCXX_DEBUG #endif #include <bits/stdc++.h> using namespace std; using ll = long long; using P = pair<int,int>; using PIL = pair<int,ll>; using PLI = pair<ll,int>; using PLL = pair<ll,ll>; template<class T> bool chmin(T &a, T b) {if(a>b){a=b;return 1;}return 0;} template<class T> bool chmax(T &a, T b) {if(a<b){a=b;return 1;}return 0;} template<class T> void show_vec(T v) {for (int i=0;i<v.size();i++) cout<<v[i]<<endl;} template<class T> void show_pair(T p) {cout<<p.first<<" "<<p.second<<endl;} template<class T> bool judge_digit(T bit,T i) {return (((bit&(1LL<<i))!=0)?1:0);} #define REP(i,n) for(int i=0;i<int(n);i++) #define ROUNDUP(a,b) (((a)+(b)-1)/(b)) #define YESNO(T) cout<<(T?"YES":"NO")<<endl #define yesno(T) cout<<(T?"yes":"no")<<endl #define YesNo(T) cout<<(T?"Yes":"No")<<endl const int INFint = 1 << 29; const ll INF = 1LL << 60; const ll MOD = 1000000007LL; const double pi = 3.14159265358979; const vector<int> h_idx4 = {-1, 0,0,1}; const vector<int> w_idx4 = { 0,-1,1,0}; const vector<int> h_idx8 = {-1,-1,-1, 0,0, 1,1,1}; const vector<int> w_idx8 = {-1, 0, 1,-1,1,-1,0,1}; int main(){ ios::sync_with_stdio(false); cin.tie(0); cout << fixed << setprecision(15); string n; cin >> n; YesNo(n.size() == 2); }