Submission #1993374

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Source Code Expand

#include <bits/stdc++.h>
#define FOR(i,a,b)  for(int (i)=(a);(i)<(b);(i)++)
#define REP(i,n)    FOR(i,0,n)
#define RER(i,n)    FOR(i,0,(n+1))
#define pb          push_back
#define mp(a,b)     make_pair((a),(b))
#define mset(m,v)   memset(m,v,sizeof(m))
using namespace std;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef vector<pair<int, int> > vpii;
typedef long long ll;
typedef vector<ll> vl;
typedef pair<ll,ll> pll;
typedef vector<pair<ll, ll> > vpll;
typedef vector<string> vs;
typedef long double ld;
const double EPS    = 1e-10;
const int INF       = 1e+9;
const double PI     = acos(-1);


auto main() -> int
{
    string a;
    cin >> a;

    if ( a.length() != 1 ) {
        cout << a.substr(0, a.length() - 1) << endl;
    } else if ( a[0] != 'a' ) {
        cout << (char)(a[0] - 1) << endl;
    } else {
        cout << -1 << endl;
    }

    return 0;
}

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