Write a program to convert a number from decimal notation to a number expressed in a number

system whose base $($or radix$)$ is a number between $2$ and $16.$ The conversion is performed by

repetitious division by the base to which a number is being converted and then taking the

remainders of division in the reverse order using a stack. For example, in converting to binary,

number $6$ requires three such divisions: $\frac{6}{2}=3$ remainder $0,\frac{3}{2}=1$ remainder $1,$ and finally, $\frac{1}{2}=$

$0$ remainder $1.$ The remainders $0,1,$ and $1$ are put in the reverse order so that the binary equivalent

of $6$ is equal to $110.$

Number systems with bases greater than $10$ require more symbols. Therefore, use capital letters.

For example, a hexadecimal system requires $16$ digits: $0,1,$dots,$9,A,B,C,D,E,F.$ In this system,

decimal number $26$ is equal to $1A$ in hexadecimal notation, because $\frac{26}{16}=1$ remainder $10($that is$,$

A$),$ and $\frac{1}{16}=0$ remainder $1.$