import sys
import os

try:
    f = open(sys.argv[1])
except:
    input_line = input()
    if os.path.exists(input_line):
        f = open(input_line)
    else:
        print("File not exists")
        sys.exit(1)

mydict = {"":0}

i=0
for line in f:
    words = line.replace(",", " ").replace('"',' ').split()

    for word in words:
        word = word.lower()
        i += 1
        if(word in mydict.keys()):
            value = mydict[word]
            value += 1
            mydict.pop(word)
        else:
            value = 1

        mydict[word] = value

print("Number of words: " + str(i))

i=0
for k, v in sorted(mydict.items(), key=lambda x: -x[1]):
    if(i >= 20):
        break
    print(str(k) + ": " + str(v))
    i += 1

f.close()