Array First Element Check

Background

Congcong is learning how to process arrays. He encountered a simple problem that requires checking a specific property of given arrays.

Problem Description

Start with two integer arrays, $a$ and $b$, of any length. Return how many of the arrays have $1$ as their first element.

Input Format

Input is given from standard input in the following format.

Two arrays, with elements of each array separated by spaces. Arrays can be empty.

Output Format

Output is printed to standard output in the following format.

An integer, representing the count of arrays whose first element is $1$.

Sample

[1 2 3] [1 3]

2

[7 2 3] [1]

1

[1 2] []

1

Sample Explanation

Sample 1: The first array [1 2 3] has $1$ as its first element, and the second array [1 3] also has $1$ as its first element. Thus, there are $2$ arrays whose first element is $1$. Sample 2: The first array [7 2 3] does not have $1$ as its first element, but the second array [1] has $1$ as its first element. Thus, there is $1$ array whose first element is $1$. Sample 3: The first array [1 2] has $1$ as its first element. The second array [] is an empty array and has no first element. Thus, there is $1$ array whose first element is $1$.

Constraints

Time limit: $1$ second, Memory limit: $1024$ KiB for each test case.