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#include<bits/stdc++.h>
using namespace std;
 
 
 
string Helper(string sr, int maxLength) {
	if (sr.size()!=0) {
		return sr;
	}
	if (sr.size() == maxLength) {
		return "";
	}
	for (char c = 'a'; c <= 'z'; c++) {
		string password = Helper (sr + c, maxLength);
		if (password != "") {
			return password;
		}
 		// Also check uppercase
 		char upperC = toupper(c);
 		password = Helper (sr + upperC, maxLength);
		if (password != "") {
 			return password;
 		}
 	}
	return "";
}
 
void solve(int maxLength) {
	if (maxLength < 0) {
 		throw maxLength;
	}
 	return Helper("", maxLength);
}
int main()
{
	int t;cin>>t;
	while(t--){
		string s;cin>>s;
		solve(s);
 
	}
	return 0;
}

prog.cpp: In function ‘void solve(int)’:
prog.cpp:32:30: error: return-statement with a value, in function returning ‘void’ [-fpermissive]
   return Helper("", maxLength);
                              ^
prog.cpp: In function ‘int main()’:
prog.cpp:39:9: error: cannot convert ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} to ‘int’
   solve(s);
         ^
prog.cpp:28:16: note:   initializing argument 1 of ‘void solve(int)’
 void solve(int maxLength) {
            ~~~~^~~~~~~~~

Standard output is empty