_==0 "exec" "gawk" "-f" "$0"
function f(a,b) {
	if ((a=="0" && b=="0")||(a=="2" && b=="2")) return "E"
	if (a=="0" || a=="1" || b=="0" || b=="1") return "S"
	return "P"
}
{ print f($1,$2) }