uNrEaDaBlE sTrInG

AtCoder

IDabc192_b

Time2000ms

Memory256MB

Difficulty—

We call a string **hard-to-read** when its odd-positioned ($1$\-st, $3$\-rd, $5$\-th, ... from the beginning) characters are all lowercase English letters and its even-positioned characters ($2$\-nd, $4$\-th, $6$\-th, ... from the beginning) are all uppercase English letters. Determine whether a string $S$ is hard-to-read. ## Constraints * $S$ consists of uppercase and lowercase English letters. * The length of $S$ is between $1$ and $1000$ (inclusive). ## Input Input is given from Standard Input in the following format: $S$ [samples]

Samples

Input #1

dIfFiCuLt

Output #1

Yes

The odd-positioned characters are all lowercase and the even-positioned characters are all uppercase, so it is hard-to-read.

Input #2

eASY

Output #2

No

The $3$\-rd character is not lowercase, so it is not hard-to-read.

Input #3

Output #3

Yes

API Response (JSON)

{
  "problem": {
    "name": "uNrEaDaBlE sTrInG",
    "description": {
      "content": "We call a string **hard-to-read** when its odd-positioned ($1$\\-st, $3$\\-rd, $5$\\-th, ... from the beginning) characters are all lowercase English letters and its even-positioned characters ($2$\\-nd, ",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc192_b"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "We call a string **hard-to-read** when its odd-positioned ($1$\\-st, $3$\\-rd, $5$\\-th, ... from the beginning) characters are all lowercase English letters and its even-positioned characters ($2$\\-nd, ...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments