fcn longer(a,b){ //-->0,1,2 (same, a longer, b longer)
   while(a and b){a=a.del(0); b=b.del(0);}
   if (not a and not b) return(0); // a & b same length
   if(a) return(1); 	// a is longer
   2			// b is longer
}

text:=a:=ask("text: ").strip();
while(b:=ask("text: ").strip()){
   switch(longer(a,b)){
      case(0){ text=String(text,"\n",b) }  // a.len()==b.len()
      case(1){ }		// a.len>b.len()
      case(2){ text=a=b }	// a.len>b.len()
   } //switch
}
println(text);