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competitive-programming/String/(CODEFORCES)946C.cpp at master · kothariji/competitive-programming · GitHub

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//solution for 946C - https://codeforces.com/contest/946/problem/C

#include<bits/stdc++.h>

using namespace std;

int main() {

string str;

cin >> str;

char ch = 'a';

bool flag = false;

for (int i=0 ; i < str.size() ; i++){

if (str[i] <= ch){

str[i] = ch;

if (ch == 'z'){

flag= true;

break;

}

ch= ch + 1;

}

}

if (!flag){

cout << -1 << endl;

}

else{

cout << str << endl;

}

return 0;

}

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