"""
write a function game(my_str) that has one string parameter
the function creates and returns 3 strings: string of all lowercase letters
string of all uppercase letters and string of all digits

write main to test your function 

"""

def game(my_str):
	low=""
	up=""
	digits=""

	#solution 1:
	size=len(my_str)
	for i in range(size): #i is and INDEX,my_str[i] - is a character
		if(my_str[i]>='a' and my_str[i]<='z'):
			low=low+my_str[i]
		elif(my_str[i]>='A' and my_str[i]<='Z'):
			up=up+my_str[i]
		elif(my_str[i]>='0' and my_str[i]<='9'):
			digits=digits+my_str[i]

	return low, up, digits

def main():
	my_str=input("enter string ")
	low, up, digits=game(my_str)	
	print("all lowercase",low)
	print("all uppercase",up)
	print("all digits",digits)
main()