# coding: utf-8
# Here your code !

def func():
    result = ""
    try:
        index = 0
        while (True):
            line = input().rstrip()
            num = int(line)
            if (num == 0):
                break

            index += 1
            result += "Case "+str(index)+": "+str(num)+"\n"

    except:
        print("input error")
        return -1

    print(result.rstrip())

func()