#include <bits/stdc++.h>
typedef long long ll;
const int INF = 1e9,MOD = 1e9+7,ohara = 1e6;
const ll LINF = 1e18;
using namespace std;

#define rep(i,n) for(ll (i)=0;(i)<(int)(n);(i)++)
#define rrep(i,a,b) for(ll i=(a);i<(b);i++)
#define rrrep(i,a,b) for(ll i=(a);i>=(b);i--)
#define all(v) (v).begin(), (v).end()
#define pb(q) push_back(q)
#define Size(n) (n).size()
#define Cout(x) cout<<(x)<<endl

ll cnt=0,a,b,d,cmp,cmpp,m,h,w,x,y,sum=0,pos,n,k;
int dy[]={1,0,-1,0};
int dx[]={0,1,0,-1};
//int dy[]={-1,0,1,-1,1,-1,0,1};
//int dx[]={-1,-1,-1,0,0,1,1,1};
string alph("abcdefghijklmnopqrstuvwxyz"),s,co,lis[ohara],ans="114514";
bool fl;
struct edge{int to,cost;};

//-------------------------↓↓↓↓↓↓------------------------

int main(void){
       cin.tie(0);
    ios::sync_with_stdio(false);
      
    cin>>s;
    co=s;
    sort(all(co));
    reverse(all(co));
    rep(i,Size(s)){
        if(s[i]!=co[i])fl=true;
    }
    if(!fl){
        Cout(s);
        return 0;
    }
    char c=s[0];
    s[0]=co[0];
    //Cout(co[0]);
    rrep(i,1,Size(s)){
        char cop=s[i];
        if(s[i]==c)continue;
        s[i]=c;
        lis[cnt++]=s;
        s[i]=cop;
    }
    rep(i,cnt){
        if(ans=="114514")ans=lis[i];
        else{
            if(ans<lis[i])ans=lis[i];
        }
    }
    Cout(ans);
    return 0;
}