#hackerrank https://www.hackerrank.com/challenges/ctci-contacts/forum

tries-contact.js

process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function main() {
  var n = parseInt(readLine());
  var contacts = '';
  var result = '';
  var indexTable = {};

  for(var a0 = 0; a0 < n; a0++){
    var op_temp = readLine().split(' ');
    var contact = op_temp[1];

    if (op_temp[0] == 'add') {
      indexTable[contact[0]] = indexTable[contact[0]] || '';
      indexTable[contact[0]] += ';' + contact;
    } else {
      var table = indexTable[contact[0]] || '';
      result += table.split(';' + contact).length - 1 + '\n';
    }
  }

  console.log(result);
}