Integer listSize is read from input, then listSize integers are read and stored into ArrayList tokensToPick. In formSequence$(),$ write the base case to output the first element, $"+",$ the second element, $"=",$ and the sum of the elements. End with a newline.

Ex: If the input is:

$3$

$2547$

then the output is:

All possible sequences of $2$:

$2+5=7$

$2+47=49$

$5+2=7$

$5+47=52$

$47+2=49$

$47+5=52$