#!/usr/bin/env python3
import sys
import regex as re

num_values = dict(
    one=1,
    two=2,
    three=3,
    four=4,
    five=5,
    six=6,
    seven=7,
    eight=8,
    nine=9,
)

sum = 0
for line in sys.stdin:
    nums = re.findall(r"one|two|three|four|five|six|seven|eight|nine|[1-9]", line, overlapped=True)
    nums = [str(num_values.get(x, x)) for x in nums]
    first = nums[0]
    last = nums[-1]
    value = int(first + last)
    sum += value

print(sum)