a,*s=open(0)
w=len(s[0])
s="".join(s)
I=s.find('R')
while 1:s[N:=(I+2+~-w*(I%w<w-2))%len(s)]!='.'==exit(print("loop")if s[N]>'A'else print(I//w+1,I%w+1));I=N