program kosarka;
var a,b,code,num1,num2,num3:integer;
    c:string;
begin
readln(a);
for b:= 1 to a do begin
readln(c);
val(c[1],num1,code);
val(c[3]+c[4],num2,code);
val(c[6]+c[7],num3,code);
end;
num2:=47-num2;
num3:=60-num3;
if num3=60 then begin
num2:=num2+1;
num3:=00;
end;
write(num1,' ',num2,':',num3);
end.