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With awk
awk 'x&&/S/{exit}x+=;x+=/R/' file
Example
seq 20 | awk 'x&&/1/{exit}x+=;x+=/6/' 6 7 8 9
awk 'x&&/S/{exit}x+=/R/' file
seq 20 | awk 'x&&/1/{exit}x+=/6/' 6 7 8 9
awk 'x&&/S/{exit};x+=/R/' file
seq 20 | awk 'x&&/1/{exit};x+=/6/' 6 7 8 9
awk 'x&&/S/{exit};x+=x+=/R/' file
seq 20 | awk 'x&&/1/{exit};x+=x+=/6/' 6 7 8 9
