If 1152 \(\equiv\) 4 \((mod \ 28)\) and 596 \(\equiv\) 8 \((mod \ 28)\), then find the subtraction and multiplication in modular arithmetic.
1. 556 \(\equiv\) \((mod \ 28)\)
2. \(\equiv\) 32 \((mod \ 28)\)
(Note: Insert a negative sign wherever necessary.)