#!/usr/bin/env python3

from sys import argv

i = [int(x) for x in open(argv[1]).read().strip().split(",")]

a = {x:t+1 for t,x in enumerate(i[:-1])}
t = len(i)
l = i[-1]
def f(x):
    global l,t
    while t < x:
        if l in a:
            n = t - a[l]
        else:
            n = 0
        a[l] = t
        t += 1
        l = n
    return l
print(f(2020))
print(f(30000000))