let shiftedDiff = (f, s) => {
let r = -1;
f.split('').forEach((e, i) => {
f = f.substr(1) + e;
if (f == s) r = f.length - (i + 1)
})
return r;
}
console.log(shiftedDiff("coffee", "eecoff"))
console.log(shiftedDiff("eecoff", "coffee"))
console.log(shiftedDiff("moose", "Moose"))
console.log(shiftedDiff("isn't", "'tisn"))
console.log(shiftedDiff("Esham", "Esham"))
console.log(shiftedDiff("dog", "god"))