System: standard ACOL no exotic conventions.
Partner opens 1D
Opposition overcall 1S
I have seven points 5 hearts, 2 rag spades, 3 rag diamonds.
I want to show that I hold sufficient for a responding bid to his opening, I don’t want to give the impression that I am strong and I don’t want to give the impression that I have cover in spades. What do I bid?