#include using namespace std; #define ALL(x) begin(x),end(x) #define rep(i,n) for(int i=0;i<(n);i++) #define debug(v) cout<<#v<<":";for(auto x:v){cout<bool chmax(T &a,const T &b){if(abool chmin(T &a,const T &b){if(b ostream &operator<<(ostream &os,const vector&v){ for(int i=0;i<(int)v.size();i++) os< istream &operator>>(istream &is,vector&v){ for(T &x:v)is>>x; return is; } // a^n (mod m) ll pow_mod(ll a,ll n,ll m){ ll ret=1; while(n){ if(n&1) ret=ret*a%m; a=(a*a)%m; n/=2; } return ret; } signed main(){ string s;cin>>s; map mp; for(auto c:s) mp[c]++; char x='?'; for(auto p:mp)if(p.second==1) x=p.first; rep(i,(int)s.size()){ if(s[i]==x){ cout<