Two string - JavaScript code - implement the function to add unique char into the array

Twostring8.js

function processData(input) {
    input = input.split('\n');
    var inputIndex = 0;
    var numCases = Number(input[inputIndex++]);

    for (var i = 0; i < numCases; i++) {
        //var wordA = processWord(input[inputIndex++]);
        //var wordB = processWord(input[inputIndex++]);

        var wordA = uniq_fast(input[inputIndex++]);
        var wordB = uniq_fast(input[inputIndex++]);

        //console.log(wordA);
        //console.log(wordB);

        if (searchWords(wordA, wordB)) {
            console.log("YES");
        } else {
            console.log("NO");
        }
    }
}

function searchWords(wordA, wordB) {
    "use strict";
    for (var j = 0; j < wordA.length; j++) {
        for (var k = 0; k < wordB.length; k++) {
            if (wordA[j] == wordB[k]) {
                return true;
            }
        }
    }
    return false;
}

function uniq_fast(a) {
    var seen = {};
    var out = [];
    var len = a.length;
    var j = 0;
    for(var i = 0; i < len; i++) {
        var item = a[i];
        if(seen[item] !== 1) {
            seen[item] = 1;
            out[j++] = item;
        }
    }
    return out;
}

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});