#!/usr/bin/env python3

import sys

def move_head(m,h):
    hx, hy = h
    if m == 'R': hx = hx + 1
    elif m == 'L': hx = hx - 1
    elif m == 'U': hy = hy + 1
    elif m == 'D': hy = hy - 1
    return hx,hy

def follow(h,t):
    hx, hy = h
    tx, ty = t
    if abs(hx - tx) > 1 or abs(hy - ty) > 1:
        if hy == ty: tx = (tx+1) if hx>tx else (tx-1)
        elif hx == tx: ty = (ty+1) if hy>ty else (ty-1)
        else:
            tx = (tx+1) if hx>tx else (tx-1)
            ty = (ty+1) if hy>ty else (ty-1)
    return (hx, hy), (tx, ty)

if __name__ == '__main__':
    moves = [tuple(line.strip('\n').split(' ')) for line in open(sys.argv[1])]
    head = (0,0)
    tail = (0,0)
    tail_pos = set([(0,0)])

    # challenge 1
    for m in moves:
        mov, num = m
        num = int(num)
        for _ in range(num):
            head = move_head(mov,head)
            head, tail = follow(head,tail)
            tail_pos.add(tail)
    res1 = str(len(tail_pos))
    print("challenge 1:" + "\n" +  res1 + "\n")

    # challenge 2
    ropes = [(0,0)] * 10
    tail_pos = set([(0,0)])
    for m in moves:
        mov, num = m
        num = int(num)
        for _ in range(num):
            ropes[0] = move_head(mov,ropes[0])
            for i in range(len(ropes)-1): ropes[i], ropes[i+1] = follow(ropes[i],ropes[i+1])
            tail_pos.add(ropes[9])
    res2 = str(len(tail_pos))
    print("challenge 2:" + "\n" +  res2 + "\n")