import sys
t=sys.stdin.read()
c=[]
a=[x for x in range(65,123) if x not in [y for y in range(91,97)]]
for x in a:
	k=t.count(chr(x))
	c.append(k)
	print "%s: %s"%(chr(x),k) if len(str(k))==2 else "%s:  %s"%(chr(x),k)