#Write a function that accepts one parameter, which is 10-digit integer, and 
#finds and prints the average of its EVEN digits. If there are no even digits in 
#the parameter, the function prints an appropriate message. Write a main 
#function to test your function 
def main():
	num=int(input("enter 10-digit number "))
	counter=0
	sumEven=0
	counterEven=0
	while(counter<10):
		digit=num%10
		if(digit%2==0):
			sumEven=sumEven+digit
			counterEven=counterEven+1
		num=num//10
		counter=counter+1
	if(counterEven>0):
		average=sumEven/counterEven
		print("average of evens is", average)
	else:
		print("no even digits")
main()