using static System.Console;
public class Program {
public static void Main() {
var fone = "(12)34567-8901";
WriteLine(fone.Substring(1, 2));
WriteLine(fone.Substring(4, 5) + fone.Substring(10, 4));
}
}
//https://pt.stackoverflow.com/q/162979/101
dXNpbmcgc3RhdGljIFN5c3RlbS5Db25zb2xlOwoJCQkJCQpwdWJsaWMgY2xhc3MgUHJvZ3JhbSB7CglwdWJsaWMgc3RhdGljIHZvaWQgTWFpbigpIHsKCQl2YXIgZm9uZSA9ICIoMTIpMzQ1NjctODkwMSI7CgkJV3JpdGVMaW5lKGZvbmUuU3Vic3RyaW5nKDEsIDIpKTsKCQlXcml0ZUxpbmUoZm9uZS5TdWJzdHJpbmcoNCwgNSkgKyBmb25lLlN1YnN0cmluZygxMCwgNCkpOwoJfQp9CgovL2h0dHBzOi8vcHQuc3RhY2tvdmVyZmxvdy5jb20vcS8xNjI5NzkvMTAx