What will be the correct output of the following JavaScript code?
'use strict'
class Sf{
    success_failure() {
    var a = 28, s=0, i ;
    for(i=1;i<=a;i++)
    {
        if(a%i==0)
          s=s+i;
    }
    if(s!=a*2)
      document.write("failure") ;
    else
      document.write("success");
  }
}

var pj = new Sf();
pj.success_failure();

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