#include <iostream>
using namespace std;
int main()
{
int i=0;
char n;
do
{cin>>n;
if(n>='A'&&n<='Z')
{n=n+32;
cout <<n<< endl;}
else if(n>='a'&&n<='z')
{n=n-32;
cout <<n<< endl;}
else if(n>='0'&&n<='9')
{cout <<n<< endl;}
else
{cout<<"other"<<endl;}
i++;}
while(i<=4);
return 0;
}
谢谢各位哥哥姐姐,孩子初学请见谅😭