Score : $100$ points

问题描述

Takahashi 的心中始终有一个整数。

最初，Takahashi 心中的整数为 $0$。现在他将要吃掉四个符号，每个符号是 + 或 -。当他吃掉 + 时，他心中的整数增加 $1$；当他吃掉 - 时，他心中的整数减少 $1$。

作为字符串 $S$ 给定的符号是 Takahashi 将要吃掉的。$S$ 中的第 $i$ 个字符即为他要吃掉的第 $i$ 个符号。

请你找出 Takahashi 吃掉所有符号后，他心中的整数是多少。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

There is always an integer in Takahashi's mind.

Initially, the integer in Takahashi's mind is $0$. Takahashi is now going to eat four symbols, each of which is + or -. When he eats +, the integer in his mind increases by $1$; when he eats -, the integer in his mind decreases by $1$.

The symbols Takahashi is going to eat are given to you as a string $S$. The $i$-th character in $S$ is the $i$-th symbol for him to eat.

Find the integer in Takahashi's mind after he eats all the symbols.

Constraints

• The length of $S$ is $4$.
• Each character in $S$ is + or -.

Input

Input is given from Standard Input in the following format:

$S$

Output

Print the integer in Takahashi's mind after he eats all the symbols.

Sample Input 1

+-++

Sample Output 1

2

• Initially, the integer in Takahashi's mind is $0$.
• The first integer for him to eat is +. After eating it, the integer in his mind becomes $1$.
• The second integer to eat is -. After eating it, the integer in his mind becomes $0$.
• The third integer to eat is +. After eating it, the integer in his mind becomes $1$.
• The fourth integer to eat is +. After eating it, the integer in his mind becomes $2$.

Thus, the integer in Takahashi's mind after he eats all the symbols is $2$.

Sample Input 2

-+--

Sample Output 2

-2

Sample Input 3

----

Sample Output 3

-4

update @ 2024/3/10 17:17:18