def count(x,A):
    c = 0
    for n in A:
        if n == x:
            c += 1
    return c

nums = []
with open("numbers.txt") as f:
    for line in f.readlines():
        x = int(line)
        nums.append(x)

counts = []
for n in range(1,21):
    counts.append((n,count(n,nums)))

with open("counts.txt","w") as f:
    for n,c in counts:
        f.write("{} {}\n".format(n,c))