Check out [the detailed writeup](https://rootfs.eu/codeblue2017-common-modulus/)

Same as the Common Modulus 2 task, but the GCD of $e_1$ and $e_2$ is 17, and the message is padded to the right with zeroes. The basic steps are the same, but we also have to calculate the padding, remove it and then take the 17-th root.