kasaka

AtCoder

IDabc237_c

Time2000ms

Memory256MB

Difficulty—

Given is a string $S$ consisting of lowercase English letters. Determine whether adding some number of `a`'s (possibly zero) at the beginning of $S$ can make it a palindrome. Here, a string of length $N$, $A=A_1A_2\ldots A_N$, is said to be a palindrome when $A_i=A_{N+1-i}$ for every $1\leq i\leq N$. ## Constraints * $1 \leq \lvert S \rvert \leq 10^6$ * $S$ consists of lowercase English letters. ## Input Input is given from Standard Input in the following format: $S$ [samples]

Samples

Input #1

kasaka

Output #1

Yes

By adding one `a` at the beginning of `kasaka`, we have `akasaka`, which is a palindrome, so `Yes` should be printed.

Input #2

atcoder

Output #2

No

Adding any number of `a`'s at the beginning of `atcoder` does not make it a palindrome.

Input #3

php

Output #3

Yes

`php` itself is a palindrome. Adding zero `a`'s at the beginning of $S$ is allowed, so `Yes` should be printed.

API Response (JSON)

{
  "problem": {
    "name": "kasaka",
    "description": {
      "content": "Given is a string $S$ consisting of lowercase English letters. Determine whether adding some number of `a`'s (possibly zero) at the beginning of $S$ can make it a palindrome. Here, a string of length ",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc237_c"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "Given is a string $S$ consisting of lowercase English letters. Determine whether adding some number of `a`'s (possibly zero) at the beginning of $S$ can make it a palindrome.\nHere, a string of length ...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments