C :

#include<stdio.h>

main()

{

    char c;                                     /*定义c为字符型*/

    int letters = 0, space = 0, digit = 0;    /*定义letters、space、digit、others、四个变量为基本整型*/
    while ((c = getchar()) != '#')                      /*当输入的不是#时执行while循环体部分*/
    {
        if (c >= 'a' && c <= 'z')

            letters++;                              /*当输入的是英文字母时变量letters加1*/

        else

            if (c >= 'A' && c <= 'Z')

                space++;                            /*当输入的是空格时变量space加1*/

        else

            if (c >= '0' && c <= '9')

                digit++;                            /*当输入的是数字时变量digit加1*/

    }

    printf("%d %d %d",space,letters,digit);    /*将最终统计结果输出*/

}

C++ :

#include<iostream>
using namespace std;

int main(){
	
	int a,b,c;
	a=0;
	b=0;
	c=0;
	
	char x;

	x=getchar();
	while(x!='#'){
		if(x>='A' && x<='Z')
			a++;
			
		if(x>='a' && x<='z')
			b++;
			
		if(x>='0' && x<='9')
			c++;
			
		x=getchar();
	}
	cout<<a<<" "<<b<<" "<<c<<endl;
	
}

Pascal :

var
  st:string;
  d,x,s,i,l:longint;
begin
  readln(st);
  l:=length(st);
  for i:=1 to l do
    if (ord(st[i])>=65) and (ord(st[i])<=90)
    then d:=d+1
    else if (ord(st[i])>=97) and (ord(st[i])<=122)
         then x:=x+1
         else if (ord(st[i])>=48) and (ord(st[i])<=57)
              then s:=s+1
              else if ord(st[i])=35
                   then break;
   writeln(d,' ',x,' ',s);
end.

Java :

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner scanner =new Scanner(System.in);
		String str=scanner.nextLine();
		String[] strArray=str.split("#");
		int dx=0;
		int xx=0;
		int sz=0;
		if(strArray.length>0){
			String s=strArray[0];
			char[] charArray=s.toCharArray();
			for(int i=0;i<charArray.length;i++){
				int intc=charArray[i];
				if(intc>=65&&intc<=90){
					dx++;
				}
				if(intc>=97&&intc<=122){
					xx++;
				}
				if(intc>=48&&intc<=57){
					sz++;
				}		
			}
			System.out.println(dx+" "+xx+" "+sz);
		}		
	}
}

Python :

str = input('')
a = 0
b = 0
c = 0
for i in str:
    if i>='A' and i<='Z':
        a += 1
    if i>='a' and i<='z':
        b += 1
    if i>='0' and i<='9':
        c += 1
print(a,b,c)