Use the RSA cipher with public key

$($n$,$ e$)=(713,43)$

to encrypt the word "SIS." Start by encoding the letters of the word "SIS" into their numeric equivalents. Assume the letters of the alphabet are encoded as follows:

A $=01,$ B $=02,$ C $=03,,$ Z $=26.$

Since the code for S is $19$ and since

e $=43=32+8+2+1,$

the first letter of the encrypted message is found by computing

$1943$ mod $713.$

$191$ a $($mod $713)192$ b $($mod $713)194$ c $($mod $713)$

$198$ d $($mod $713)1916$ e $($mod $713)1932$ f $($mod $713)$

The result is that a $=$