const book = [
    {name: 'aaa', phones: [111,222,333]},
    {name: 'bbb', phones: [444,555,222]},
    {name: 'ccc', phones: [333]},
    {name: 'ddd', phones: [777]}
]
 
// aaa, bbb: 222
// aaa, ccc: 333
 
function findContactsByPhone (book, number = 0) {
	// Ваш код здесь
}