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ABC306 - A - Echo 自己解法

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問題

考察

与えられた文字列を各文字2個ずつ並べてくださいという問題です。文字列を1文字ずつ取り出し、それぞれ2回ずつ出力していきましょう。1文字ずつ取り出すのを繰り返す処理を書くにはfor文が便利です。

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ご不明点などがあれば教えていただけると幸いです。

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