Repeated Substring Pattern

Return True if s can be written as a block repeated two or more times ("abab" is "ab" twice; "aaa" is "a" three times; "abcab" is not).

A string with fewer than 2 letters gives False.

Examples

Example 1

Input:

repeated_substring_pattern('abab')

Output:

True

Example 2

Input:

repeated_substring_pattern('abcab')

Output:

False

Constraints

• 0 <= len(s) <= 200000
• Lower-case letters.