#!/usr/bin/env python
# randwalk.py

from random import randrange

def main():
    print "A random walk simulator.\n"
    n = input("How many steps will you take? ")
    walk = 0
    for i in range(n):
        step = randrange(1,3)
        if step == 1:
            walk = walk + 1
        else:
            walk = walk - 1
    if walk < 1:
        print "You moved backward", walk, "steps."
    elif walk == 0:
        print "You did not move at all"
    else:
        print "You advanced", walk, "steps."
    print
    
if __name__ == '__main__':
    main()