C :

int main(int argc, char* argv[])
{
	char c;
	while(~scanf("%c%*c",&c))
	{
	  printf("%c\n",c+32);
	}
	return 0;
}

C++ :

#include<iostream>
using namespace std;
int main()
{
	char a,b;
	int d,e;
	cin>>a;
	d=(int)a;
	//大写字母减肥记
	
	//非大写字母减肥记
	d=d+32;
	cout<<(char)d<<endl;
	
}