var alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
var input = prompt("Type in a message","");
var i;
for ( i = 0; i < alphabet.length; i++)
{
if(input.includes(alphabet[i]) == false)
break;
}
if ( i == alphabet.length)
alert("Bingo");
else
alert("Bollocks!");