Numbers with variable repeating digits The number \${4...4}1\$ can be written as the expression \$\frac{4 \times 10^{a+1} - 13}{9}\$, where the variable \$a\$ represents the number of \$4\$s. Given such a number, output its corresponding expression. Rules The term doesn't have to be in the simpl...

Decode Caesar cipher based on a given text I can't think of a better name. This is similar to this challenge, but a lot easier. Read three strings which contain only uppercase letters. The length of the first and second strings are the same. The second string and the third string are encrypted us...