import re
import copy

f = open('input.txt', 'r')
# content = f.read()
digits = [
['one',     '1'],
['two',     '2'],
['three',   '3'],
['four',    '4'],
['five',    '5'],
['six',     '6'],
['seven',   '7'],
['eight',   '8'],
['nine',    '9'],]

sum = 0
while line := f.readline():
    min_idx = len(line)
    min_val = ''
    max_idx = 0
    max_val = ''
    for digit in digits:
        idx = line.find(digit[0])
        if ((idx != -1) and (idx < min_idx)):
            min_idx = copy.copy(idx)
            min_val = digit[1]
    line = line[:min_idx]+min_val+line[min_idx:]

    for digit in digits:
        idx = line.rfind(digit[0])
        if idx > max_idx:
            max_idx = copy.copy(idx)
            max_val = digit[1]
    line = line[:max_idx]+max_val+line[max_idx:]
    
    # print(line.rstrip())
    new_line = re.sub("[^0-9]", "", line.rstrip())
    num = int(new_line[0])*10+int(new_line[-1])
    # print(num)
    sum = sum + num
f.close()

print(sum)