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문제

You have hired someone to help you with inventory on the farm. Unfortunately, the new cowhand has very limited math skills, and they are having trouble summing two numbers. Write a program to determine if the cowhand is adding these numbers correctly.

입력

The first and only line of input contains a string of the form:

a + b = c

It is guaranteed that a, b, and c are single-digit integers. The input line will have exactly 9 characters, formatted exactly as shown, with a single space separating each number and arithmetic operator.

출력

Print on a single line, YES if the sum is correct; otherwise, print NO.

예제 입력 1

1 + 2 = 3

예제 출력 1

YES

예제 입력 2

2 + 2 = 5

예제 출력 2

NO