AC题解

#include<bits/stdc++.h>
using namespace std;
int main(){
string s;
cin >> s;
int sum=0;
for(int i=0;i < s.size();i++){
if(s[i] == 'a' || s[i] == 'e' || s[i] == 'i' || s[i] == 'o' || s[i] == 'u'){//列举元音字母
cout << s[i];
sum++;
}
}
if(sum == 0){//特判，若没有元音字母，输出-1
cout << -1;
}
}