JSFiddle - React, Tailwind, and code Playground

JavaScript

//var s='from Moscow to Piter';
//var s=' Moвввscow - Piter ';
//var s='из города Moscow в город Piter';
//var s='из Moscow в Piter';

function findCities(str) {
	var cities = [];
	var strArray = str.split(' ');
  for (var i=1; i<strArray.length; i++) {
  	if(strArray[i][0] === strArray[i][0].toUpperCase()) cities.push(strArray[i]);
  }
 	return cities;
}

console.log(findCities(s));