returns the text that is the longest. if there is a tie, concatenate the text$($s$),$ seperated by underscores in same order of the arguments

$>>>$ task$1("$hi$",$ "bye", "hello"$)$

'hello'

$>>>$ task$1("$hello$",$ "create", "every"$)$

'create'

$>>>$ task$1("$hi$","$al$","$oh$")$

$\text{'}$hi$\_$al$\_$oh$\text{'}$

$>>>$ task$1("$two$","$hi$",$ "one"$)$

'two$\_$one'

$>>>$ task$1("","","")$

$\text{'}\text{'}$