#!/usr/bin/python3

# DO NOT EDIT - This file is being maintained by Chef

import os
import sys

def main():
    for line in sys.stdin:
        path = line.strip()

        # Construct the file path and resolve its real path,
        # which will consider any symbolic links
        file = os.path.realpath(f"/store/planet{path}")

        # Check if the constructed file path starts with '/store/planet'
        # and if the file actually exists
        if file.startswith('/store/planet') and os.path.isfile(file):
            # Print the portion of the path after '/store/planet'
            # and immediately flush the output
            print(file[len('/store/planet'):], flush=True)
        else:
            # If the file does not exist or the path does not start with
            # the expected prefix, print "NULL" and flush the output
            print("NULL", flush=True)

if __name__ == "__main__":
    main()