#import<cstdio>
int h,w,p,i;char t[9999999];int main(){scanf("%d%d",&h,&w);for(;i<h;scanf("%s",t+i++*w));for(i=0;t[i];i++)if(t[i]=='R')p=i;while(t[(p+=(++p%w)?w:0)%=i]=='.');if(t[p]=='R')printf("loop");else printf("%d %d",p/w?p/w:h,p%w?p%w:w);}