Dart, 179165 bytes
fF(List s)=>s.indexWhere((a)=>a.contains('*'));f(String s){var b=s.split('\n'),v=b.indexWhere((a)=>a.containsv=F("*")b),c=b[v].split(' '),w=c.indexWhere((a)=>a.containsw=F('*')c),x=c[w].indexOf('*')+1;return '${w+1}${b.length-v}$x';}