$4.$ In radix$-26,$ write down the numeral string for each of the following character strings, followed by the number of $$digits$($i$.$e$.,$ the length of the numeral string$)$ in each case.

i$.$key$$

ii$.$random$$

iii. $$or$$

iv$.$digit$$

a$)$ For each case of problem $($a$),$ determine the number

b$)$ Determine the byte form for each number computed in problem $($a$).$

c$)$ What is the smallest power of the radix $(26)$ that is greater than each of the numerical strings determined in $($a$)$