Submission #1071367

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Source Code Expand

#include "bits/stdc++.h"

#define REP(i,n) for(int i=0;i<n;++i)
#define RREP(i,n) for(int i=n-1;i>=0;--i)
#define FOR(i,m,n) for(int i=m;i<n;++i)
#define RFOR(i,m,n) for(int i=n-1;i>=m;--i)
#define ALL(v) v.begin(),v.end()
#define PB(a) push_back(a)
#define INF 1000000001
#define MOD 1000000007
#define EPS 1e-9

const int dx[8] = { 1,1,0,-1,-1,-1,0,1 };
const int dy[8] = { 0,1,1,1,0,-1,-1,-1 };

using namespace std;


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	string s;
	cin >> s;
	if (s.size() == 1 ) {

		if(s[0] == 'a')	cout << -1 << endl;
		else cout << 'a' << endl;
	}
	else cout << s.substr(0, s.size() - 1) << endl;
}

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