Find the output of the below code if the file 'app.js' is executed.

file1.js:  

exports.a = "John"; 

file2.js: 

var a = require('./file1'); 
a.a = "Jack"; 

app.js: 

var a = new require('./file1'); 
var b = require('./file2'); 
console.log(a.a); 

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