s1=input()
n=0
for i in range(97,97+27):
    n=s1.count(chr(i))
    if n>0:
        print("{}:{}".format(chr(i),n),end=" ")
/**************************************************************
	Problem: 1164
	User: admin
	Language: Python
	Result: Accepted
	Time:98 ms
	Memory:34244 kb
****************************************************************/