#!/usr/bin/env python

a = {}
n = 2;
for line in open("out2.txt"):
	for i in range(len(line) - n + 1):
		c = line[i : i + n];
		if "\n" in c:
			break
		elif c in a:
			a[c] += 1
		else:
			a[c] = 1

for key in sorted(a):
	print key + "\t" + str(a[key])