Equality Check

Read a quiz line formatted as 'a + b = c' and print YES if a + b equals c, otherwise NO.

Easy1ImplementationMathNo attempts yetTime limit1sMemory limit512 MB

Description

Examples4

Problem

You are grading an arithmetic quiz. The quiz asks a student for the sum of two numbers, and the student writes down one answer. Decide whether that answer is correct.

Input

The first and only line contains a string of the form a + b = c. Each of $a$ , $b$ , $c$ is a single-digit positive integer, so $1 \le a, b, c \le 9$ . The line is exactly 9 characters long, with one space between every number and symbol.

Output

Print YES on the first line if the sum is correct, and NO otherwise.