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Find the IP address class

Find the IP address class

# Task 
Given an IP address as a string, find its [IP address class.](https://www.guru99.com/ip-address-classes.html)

For reference, here is a table:


<table class="wikitable" style="width: 855px;">
<tbody>
<tr>
<th style="width: 92px;">Class</th>
<th style="width: 45px;">Leading<br>bits</th>
<th style="width: 175px;">Number<br>of networks</th>
<th style="width: 160px;">Addresses<br>per network</th>
<th style="width: 29px;">Total addresses<br>in class</th>
<th style="width: 43px;">Start address</th>
<th style="width: 146px;">End address</th>
</tr>
<tr>
<td style="width: 92px;">Class A</td>
<td style="width: 45px;">0</td>
<td style="width: 175px;">128 (2<sup>7</sup>)</td>
<td style="width: 160px;">16,777,216 (2<sup>24</sup>)</td>
<td style="width: 29px;">2,147,483,648 (2<sup>31</sup>)</td>
<td style="width: 43px;">0.0.0.0</td>
<td style="width: 146px;">127.255.255.255</td>
</tr>
<tr>
<td style="width: 92px;">Class B</td>
<td style="width: 45px;">10</td>
<td style="width: 175px;">16,384 (2<sup>14</sup>)</td>
<td style="width: 160px;">65,536 (2<sup>16</sup>)</td>
<td style="width: 29px;">1,073,741,824 (2<sup>30</sup>)</td>
<td style="width: 43px;">128.0.0.0</td>
<td style="width: 146px;">191.255.255.255</td>
</tr>
<tr>
<td style="width: 92px;">Class C</td>
<td style="width: 45px;">110</td>
<td style="width: 175px;">2,097,152 (2<sup>21</sup>)</td>
<td style="width: 160px;">256 (2<sup>8</sup>)</td>
<td style="width: 29px;">536,870,912 (2<sup>29</sup>)</td>
<td style="width: 43px;">192.0.0.0</td>
<td style="width: 146px;">223.255.255.255</td>
</tr>
<tr>
<td style="width: 92px;">Class D (multicast)</td>
<td style="width: 45px;">1110</td>
<td style="width: 175px;">not defined</td>
<td style="width: 160px;">not defined</td>
<td style="width: 29px;">268,435,456 (2<sup>28</sup>)</td>
<td style="width: 43px;">224.0.0.0</td>
<td style="width: 146px;">239.255.255.255</td>
</tr>
<tr>
<td style="width: 92px;">Class E (reserved)</td>
<td style="width: 45px;">1111</td>
<td style="width: 175px;">not defined</td>
<td style="width: 160px;">not defined</td>
<td style="width: 29px;">268,435,456 (2<sup>28</sup>)</td>
<td style="width: 43px;">240.0.0.0</td>
<td style="width: 146px;">255.255.255.255</td>
</tr>
</tbody>
</table>


The simplest way to find the class of an address is to check the bits of its first octet. Once you find the the answer, you are required to output a character or a codepoint which represents one of the characters A, B, C, D or E.

- The given IP will always be valid, and ti will always be a string.
- IP will not have insignificant zeroes.
- IP will not be in any form other than IPv4 dot notation. 

# Rules
This is code-golf. Shortest answer in each language wins.