#!/usr/bin/python3
# written by andrewt@unsw.edu.au as a COMP(2041|9044) lecture example

# Print the last number (real or integer) on every line
# Note: regexp to match number:  -?\d+\.?\d*
# Note use of findall to find all numbers

import re, sys

for line in sys.stdin:
    numbers = re.findall(r'(-?\d+\.?\d*)\D*$', line)
    if numbers:
        print(numbers[-1])