Mo and Larry have devised a way of encrypting messages. They first decide secretly on the number of columns and write the message (letters only) down the columns, padding with extra random letters so as to make a rectangular array of letters. For example, if the message is ��There��s no place like home on a snowy night�� and there are five columns, Mo would write downMo and Larry have devised a way of encrypting m
阅读背景：
2208_To and Fro(字符串操作，没什么意思)
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