太简单了，哈哈哈

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int Letters=0,Digits=0,js=0;
	char ch[1001];
	fgets(ch,1001,stdin);
	int len=strlen(ch);
	for(int i=0;i<=len-1;i++)
	{
		if(ch[i]>='a' and ch[i]<='z')
		{
			Letters++;
		}
		if(ch[i]>='0' and ch[i]<='9')
		{
			Digits++;
		}	
		else
		{
			js=len-Letters-Digits-2;
		}
	}
	cout<<"Letters="<<Letters<<endl;
	cout<<"Digits="<<Digits<<endl;
	cout<<"Others="<<js<<endl;
}