BYD一堆人写题解不加代码框

#include<bits/stdc++.h>
using namespace std;
int main(){
	string s1,s2;
	cin>>s1>>s2;
	for(int i=0;i<s1.size();i++){
		if('A'<=s1[i]&&s1[i]<='Z'){
			cout<<s1[i];
		}else if('a'<=s1[i]&&s1[i]<='z'){
			cout<<s1[i];
		}
	}
	cout<<",";
	for(int i=0;i<s2.size();i++){
		if('A'<=s2[i]&&s2[i]<='Z'){
			cout<<s2[i];
		}else if('a'<=s2[i]&&s2[i]<='z'){
			cout<<s2[i];
		}
	}
	return 0;
}