Chef And Strings 1

After his marriage when one day chef was talking to his wife he found that she liked a lot of riddles. One day she told him about power of a string and asked him to solve a problem for her. His wife told him the following things about the $Kth$ power of a string The $Kth$ power of a string $i$ is denoted as $i^k$ and this string $i^k$ is obtained by concatenating $K$ copies of the string $I$