Problem - Super Pow

Calculate $a^b \mod 1337$ where $b$ is given as an array of digits. For example, if $a = 2$ and $b = [1, 0]$, you compute $2^{10} \mod 1337 = 1024$.

The exponent $b$ can be large (up to 2100 digits), so you cannot convert it to a regular integer. This tests your understanding of modular exponentiation properties.