缺失的数字 - Problem

#1371. 缺失的数字

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This problem is prepared by xiaowuc1 .

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

你在教幼儿园！你在白板上按顺序写下了从 $1$ 到 $n$ 的数字。当你没注意的时候，其中一个学生擦掉了一个数字。

你能告诉我们那个淘气的学生擦掉了哪个数字吗？

输入

输入的第一行包含一个整数 $n$ ($2 \le n \le 100$)，表示你写下的数字个数。

输入的第二行包含一个数字字符串，表示你写下的数字（减去被擦掉的那个）。这个字符串中没有空格。保证该字符串包含从 $1$ 到 $n$ 的所有数字（按顺序排列），除了被学生擦掉的那个数字。

输出

输出一个整数，即那个调皮的学生擦掉的数字。

样例

输入格式 1

5
1235

输出格式 1

输入格式 2

10
1234568910

输出格式 2

输入格式 3

15
1234567891012131415

输出格式 3

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