#Write a program that reads one 3-digit positive integer. The 
#program checks whether at least
#one of the digits equals 3.

#Discussion
#Input: one integer between 100 and 999, stored in variable num
#Calculations: 
#Example 1: num=567 
#last=num%10=567%10=7
#num=num//10=567//10=56
#middle=num%10=56%10=6
#num=num//10=56//10=5
#first=num%10=5%10=5
#Example 2: num=891
#last=891%10=1
#num=num//10=89
#middle=num%10=89%10=9
#num=num//10=8
#first=num%10=8%10=8 

#to check if at least one of the digits equals 3 we need to use 
#if/else and logical operators

#Input limits: num>=100 and num<=999

#Program
#Input
num=int(input("enter 3-digit positive int "))
#Calculations:
if(num>=100 and num<=999):
	last=num%10
	num=num//10
	middle=num%10
	num=num//10
	first=num%10
	print("the digits are", first, middle, last)
	if(first==3 or middle==3 or last==3):
		print("at least one digit equals 3")
	else:
		print("none of digits equals 3")
else:
	print("Invalid input")