Taco Transformation

You are given two integers a and b. Your task is to determine whether it is possible to transform a into b using a custom defined operation. The operation is defined as follows: you can append some digits to the right of a (i.e. perform a combine operation) so that the resulting number has b as its target form.

In other words, if we denote the decimal representation of a by \(a_s\) and that of b by \(b_s\), then the transformation is possible if and only if \(b_s\) starts with \(a_s\). Mathematically, this condition can be written as:

[ b_s = a_s ; X, ]

where \(X\) represents some (possibly empty) string of digits. If the condition holds, print YES; otherwise, print NO.

inputFormat

The input consists of two space-separated integers a and b provided via standard input.

Example:

123 1234

outputFormat

Output a single line containing either YES if the transformation is possible, or NO otherwise.

## sample

123 1234

YES

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