#include<string>
using namespace std;
int add(int a,int b)
{
return a+b;
}
string add(char a,char b)
{
string s = "\0";
return s+a+b;
}
int main()
{
int a,b;
cout<<"輸入a,b:";
cin>>a>>b;
cout<<add(a,b)<<endl;
char c,d;
cout<<"輸入c,d:";
cin>>c>>d;
cout<<add(c,d)<<endl;
}