function editor(input) {
let str = input;
while (!/></g.test(str)) {
str = str.replace(/>1/, "3>");
str = str.replace(/>2/, "2>");
str = str.replace(/>3/, "1>");
str = str.replace(/3</, "<1");
str = str.replace(/2</, "<3");
str = str.replace(/1</, "<2");
}
return str;
}