How to get specific data from CURL in unity

I am trying to get specific data from CURL but i get whole data Here is the code using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class getRequest : MonoBehaviour {
 
     // Use this for initialization
     void Start () {
         string url = "https://blockchain.info/ticker";
         WWW www = new WWW(url);
         StartCoroutine(WaitForRequest(www));
 
     }
     IEnumerator WaitForRequest(WWW www)
     {
         yield return www;
 
         // check for errors
         if (www.error == null)
         {            
             Debug.Log("WWW Ok!: " +www.data);
         }
         else
         {
             Debug.Log("WWW Error: " + www.error);
         }
     }
 }
 

Geting OUTPUT like this WWW Ok!: { "USD" : {"15m" : 1740.01, "last" : 1740.01, "buy" : 1740.01, "sell" : 1744.74, "symbol" : "$"}, "ISK" : {"15m" : 179479.11, "last" : 179479.11, "buy" : 179479.11, "sell" : 179967, "symbol" : "kr"}, "HKD" : {"15m" : 13551.08, "last" : 13551.08, "buy" : 13551.08, "sell" : 13587.92, "symbol" : "$"}, "TWD" : {"15m" : 52292.17, "last" : 52292.17, "buy" : 52292.17, "sell" : 52434.32, "symbol" : "NT$"}, "CHF" : {"15m" : 1733.63, "last" : 1733.63, "buy" : 1733.63, "sell" : 1738.35, "symbol" : "CHF"}, "EUR" : {"15m" : 1584.76, "last" : 1584.76, "buy" : 1584.76, "sell" : 1589.07, "symbol" : "€"}, "DKK" : {"15m" : 11790.2, "last" : 11790.2, "buy" : 11790.2, "sell" : 11822.25, "symbol" : "kr"}, "CLP" : {"15m" : 1161247.87, "last" : 1161247.87, "buy" : 1161247.87, "sell" : 1164404.58, "symbol" : "$"}, "CAD" : {"15m" : 2373.57, "last" : 2373.57, "buy" : 2373.57, "sell" : 2380.02, "symbol" : "$"}, "INR" : {"15m" : 111442.86, "last" : 111442.86, "buy" : 111442.86, "sell" : 111745.8, "symbol" : "₹"}, "CNY" : {"15m" : 11994.67, "last" : 11994.67, "buy" : 11994.67, "sell" : 12027.28, "symbol" : "¥"}, "THB" : {"15m" : 60079.94, "last" : 60079.94, "buy" : 60079.94, "sell" : 60243.26, "symbol" : "฿"}, "AUD" : {"15m" : 2342.53, "last" : 2342.53, "buy" : 2342.53, "sell" : 2348.9, "symbol" : "$"}, "SGD" : {"15m" : 2434.82, "last" : 2434.82, "buy" : 2434.82, "sell" : 2441.44, "symbol" : "$"}, "KRW" : {"15m" : 1943939.17, "last" : 1943939.17, "buy" : 1943939.17, "sell" : 1949223.53, "symbol" : "₩"}, "JPY" : {"15m" : 197725.17, "last" : 197725.17, "buy" : 197725.17, "sell" : 198262.66, "symbol" : "¥"}, "PLN" : {"15m" : 6655.07, "last" : 6655.07, "buy" : 6655.07, "sell" : 6673.16, "symbol" : "zł"}, "GBP" : {"15m" : 1347.87, "last" : 1347.87, "buy" : 1347.87, "sell" : 1351.53, "symbol" : "£"}, "SEK" : {"15m" : 15356.67, "last" : 15356.67, "buy" : 15356.67, "sell" : 15398.41, "symbol" : "kr"}, "NZD" : {"15m" : 2522.84, "last" : 2522.84, "buy" : 2522.84, "sell" : 2529.69, "symbol" : "$"}, "BRL" : {"15m" : 5391.27, "last" : 5391.27, "buy" : 5391.27, "sell" : 5405.92, "symbol" : "R$"}, "RUB" : {"15m" : 98152.22, "last" : 98152.22, "buy" : 98152.22, "sell" : 98419.04, "symbol" : "RUB"}
}

But i want output like this USD 1740.01 $

Can any one please help me