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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Difficulty Alpha
A chessboard pattern is a pattern that satisfies the following conditions:
• The pattern has a rectangular shape.
• The pattern contains only the characters '.' (a dot) and 'X' (an uppercase letter X).
• No two symbols that are horizontally or vertically adjacent are the same.
• The symbol in the lower left corner of the pattern is '.' (a dot).
You are given two numbers. N is a number of rows and M is a
number of columns. Write a program that generates the chessboard pattern
with these dimensions, and outputs it.
Input
The first line contains two numbers N and M
(1 ≤ N ≤ 50, 1 ≤ M ≤ 50) separated by a whitespace.
Output
Output should contain N lines each containing M symbols that
correspond to the generated pattern. Specifically, the first character
of the last row of the output represents the lower left corner (see example 1).
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Input 1
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Input 2
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Input 3
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8 8
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3 1
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1 20
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Output 1
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Output 2
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Output 3
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X.X.X.X.
.X.X.X.X
X.X.X.X.
.X.X.X.X
X.X.X.X.
.X.X.X.X
X.X.X.X.
.X.X.X.X
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.
X
.
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.X.X.X.X.X.X.X.X.X.X
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Для отправки решений необходимо выполнить вход.
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