Check Number Palindrome

You are given a string that contains a sequence of digits. Your task is to determine whether the number represented by the string is a palindrome (a number that reads the same backward as forward).

You should carefully analyze the input string and reason about whether it forms a palindrome number.

# Steps

1. Receive the input string representing the number.
2. Check if the string reads the same backward and forward.
3. Provide a clear yes or no answer based on whether it is a palindrome.

# Output Format

Respond with a single word: "Yes" if the number is a palindrome, or "No" if it is not.

# Examples

Input: "121"
Output: "Yes"

Input: "123"
Output: "No"

Input: "1221"
Output: "Yes"

# Notes

- The input is guaranteed to consist only of digits.
- Leading zeros should be treated as part of the string when checking for palindrome.
- Do not perform any integer conversions that may strip leading zeros.