Make REST to communicate with SOAP

I have two systems: one (let it be called S1), which provides a RESTful API (let it be called WS1), and the other (let it be called S2), which provides a SOAP API (let it call WS2).

I am trying to figure out a way to get data from S1 and add it to S2. WS1 provides methods for adding / receiving data (to / from S1), while WS2 only has methods for adding data (to S2).

Can these two web services communicate with each other or should there be some mechanism between them. I suppose that "someone should manage their discussion."