let datos = [2,3,6,7,9,1];
let aux;
aux = datos[datos.length-1]
for (let i = datos.length-1 ; i>0 ; i--){
datos[i]=datos[i-1]
}
datos[0]=aux
console.log(datos)
bGV0IGRhdG9zID0gWzIsMyw2LDcsOSwxXTsKbGV0IGF1eDsKYXV4ID0gZGF0b3NbZGF0b3MubGVuZ3RoLTFdCmZvciAobGV0IGkgPSBkYXRvcy5sZW5ndGgtMSA7IGk+MCA7IGktLSl7CglkYXRvc1tpXT1kYXRvc1tpLTFdCn0KZGF0b3NbMF09YXV4CmNvbnNvbGUubG9nKGRhdG9zKQ==