Solve problem "Bishop moves" online - Learn Python 3 - Snakify

## Statement

In chess, the bishop moves diagonally, any number of squares. Given two different squares of the chessboard, determine whether a bishop can go from the first to the second in one move.

The program receives as input four numbers from 1 to 8, specifying the column and row numbers of the starting square and the column and row numbers of the ending square. The program should output YES if a Bishop can go from the first square to the second in one move, or NO otherwise.

In all the problems input the data using input() and print the result using print().

## Tests

Input Correct answer Result
4
4
5
5
YES
4
4
5
4
NO
4
4
5
3
YES
4
4
4
5
NO
4
4
3
5
YES
4
4
4
3
NO
4
4
3
4
NO
4
4
3
3
YES
1
1
1
8
NO
1
1
8
8
YES
1
1
8
1
NO
1
8
8
8
NO
1
8
8
1
YES
1
8
1
1
NO
8
8
8
1
NO
8
8
1
1
YES
8
8
1
8
NO
8
1
1
1
NO
8
1
1
8
YES
8
1
8
8
NO
1
1
1
2
NO
1
1
2
2
YES
1
1
2
1
NO
4
4
6
6
YES
4
4
2
2
YES
4
4
6
2
YES
4
4
2
6
YES
4
4
2
7
NO
4
4
4
6
NO
4
4
2
4
NO
7
4
2
5
NO
7
5
1
1
NO