number base decoded message
<p>I have this piece of decoded message, it's a homework but i can't solve it, the message is </p>

<p><code>IZWGCZZ2EBAUWRSVOJAU45DSOVCEOZKS
N5CHKQLSM5GGSQ2VNVIECUSEIU======</code></p>

<p>there is a hint saying <code>The string is encoded using an unusual number base. The numbers 2 - 7 are represented and the letters A - Z are represented.</code></p>

<p>i have looked into the internet but i couldn't find anything, please if anyone could help understand this problem and solve it i would appreciate it</p>