# -*- coding:utf-8 -*-
def solve():
	global check
	s = raw_input()
	s2 = list(s)
	s2.sort()
	mx = s2[::-1][0]
	mx = check.index(mx)
	if mx < 2:
		mx = 2
	else:
		mx += 1
	num = 0
	nums = 1
	for i in s[::-1]:
		temp = check.index(i)
		num += temp * nums
		nums *= mx
	return num



if __name__ == "__main__":
	nums = map(str,xrange(10))
	alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	alpha = list(alpha)
	check = nums + alpha
	n = input()
	ans = float("INF")
	for i in xrange(n):
		temp = solve()
		ans = min(temp,ans)
	print ans