Score : $200$ points

问题描述

给定两个由小写英文字母组成的字符串 $S$ 和 $T$。判断 $S$ 是否为 $T$ 的前缀。

何为前缀？对于长度为 $N$ 的字符串 $T_1T_2\ldots T_N$，其前缀是一个字符串，表示为 $T$ 的前 $i$ 个字符 $T_1T_2\ldots T_i$，其中 $i$ 是一个整数，满足 $0 \leq i \leq N$。例如，当 $T =$ abc 时，$T$ 有四个前缀：空字符串、a、ab 以及 abc。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

You are given two strings $S$ and $T$ consisting of lowercase English letters. Determine if $S$ is a prefix of $T$.

What is a prefix? A prefix of a string $T_1T_2\ldots T_N$ of length $N$ is a string expressed as the first $i$ characters of $T$, $T_1T_2\ldots T_i$, where $i$ is an integer such that $0 \leq i \leq N$. For example, when $T =$ abc, there are four prefixes of $T$: an empty string, a, ab, and abc.

Constraints

• $S$ and $T$ are strings of lengths between $1$ and $100$ (inclusive) consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

$S$

$T$

Output

Print Yes if $S$ is a prefix of $T$; print No otherwise. Note that the judge is case-sensitive.

Sample Input 1

atco
atcoder

Sample Output 1

Yes

atco is a prefix of atcoder. Thus, Yes should be printed.

Sample Input 2

code
atcoder

Sample Output 2

No

code is not a prefix of atcoder. Thus, No should be printed.

Sample Input 3

abc
abc

Sample Output 3

Yes

Note that a string is also a prefix of itself.

Sample Input 4

aaaa
aa

Sample Output 4

No

update @ 2024/3/10 11:17:47