hello is a name i want place with "l" as "$"

Question

1.hello is a name .I want place with "l" as "$" .and i want both replace with "l" as "$" and with with out replace "l" as "dollar" in coding.

o/p is "HE$$O"

 

2.assam  is a name.I want how many times "s" was reading.Please show in coding.