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#include <bits/stdc++.h>
using namespace std;
 
string s;
char c;
 
int main() {
    int s;
    if(s.size()<26) cout<<-1<<endl;
 
    else{
       for(int i=0; i<s.size(); i++) {
          if(s[i]<=c) s[i]=c; c++;
          if(c> 'z') return cout <<s<<endl;
          else cout<<-1<<endl ;
       }
 
    }
 
}

prog.cpp: In function ‘int main()’:
prog.cpp:9:10: error: request for member ‘size’ in ‘s’, which is of non-class type ‘int’
     if(s.size()<26) cout<<-1<<endl;
          ^~~~
prog.cpp:12:25: error: request for member ‘size’ in ‘s’, which is of non-class type ‘int’
        for(int i=0; i<s.size(); i++) {
                         ^~~~
prog.cpp:13:17: error: invalid types ‘int[int]’ for array subscript
           if(s[i]<=c) s[i]=c; c++;
                 ^
prog.cpp:13:26: error: invalid types ‘int[int]’ for array subscript
           if(s[i]<=c) s[i]=c; c++;
                          ^
prog.cpp:14:39: error: cannot convert ‘std::basic_ostream<char>::__ostream_type’ {aka ‘std::basic_ostream<char>’} to ‘int’ in return
           if(c> 'z') return cout <<s<<endl;
                                       ^~~~

Standard output is empty