import sys
import math
# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.
x = []
ans = ""
n = int(input())
for i in range(n):
    t = input()
    x.append(t)
# Write an action using print
    print("Debug messages...",t, file=sys.stderr)
if n > 1:
    for j in range(n):
        if int(x[j][:1]) == 0 or int(x[j-1][:1]) == 0:
            if int(x[j][:2]) > int(x[j-1][:2]):
                ans = x[j-1]
    print(ans)
else:
    print(x[0])