103730: [Atcoder]ABC373 A - September

Problem Statement

There are $12$ strings $S_1, S_2, \ldots, S_{12}$ consisting of lowercase English letters.

Find how many integers $i$ $(1 \leq i \leq 12)$ satisfy that the length of $S_i$ is $i$.

Constraints

• Each $S_i$ is a string of length between $1$ and $100$, inclusive, consisting of lowercase English letters. $(1 \leq i \leq 12)$

Input

The input is given from Standard Input in the following format:

$S_1$
$S_2$
$\vdots$
$S_{12}$

Output

Print the number of integers $i$ $(1 \leq i \leq 12)$ such that the length of $S_i$ is $i$.

Sample Input 1

january
february
march
april
may
june
july
august
september
october
november
december

Sample Output 1

1

There is only one integer $i$ such that the length of $S_i$ is $i$: $9$. Thus, print 1.

Sample Input 2

ve
inrtfa
npccxva
djiq
lmbkktngaovl
mlfiv
fmbvcmuxuwggfq
qgmtwxmb
jii
ts
bfxrvs
eqvy

Sample Output 2

2

There are two integers $i$ such that the length of $S_i$ is $i$: $4$ and $8$. Thus, print 2.

问题陈述

有 $12$ 个由小写英文字母组成的字符串 $S_1, S_2, \ldots, S_{12}$。

找出有多少个整数 $i$ $(1 \leq i \leq 12)$ 满足 $S_i$ 的长度为 $i$。

约束条件

• 每个 $S_i$ 是一个长度在 $1$ 到 $100$（包括）之间，由小写英文字母组成的字符串。$(1 \leq i \leq 12)$

输入

输入从标准输入以下格式给出：

$S_1$
$S_2$
$\vdots$
$S_{12}$

输出

打印满足 $S_i$ 的长度为 $i$ 的整数 $i$ 的数量 $(1 \leq i \leq 12)$。

示例输入 1

january
february
march
april
may
june
july
august
september
october
november
december

示例输出 1

1

只有一个整数 $i$ 满足 $S_i$ 的长度为 $i$：$9$。因此，打印 1。

示例输入 2

ve
inrtfa
npccxva
djiq
lmbkktngaovl
mlfiv
fmbvcmuxuwggfq
qgmtwxmb
jii
ts
bfxrvs
eqvy

示例输出 2

2

有两个整数 $i$ 满足 $S_i$ 的长度为 $i$：$4$ 和 $8$。因此，打印 2。