Doubt with Encoder Binary Decimal

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crf_h0m3r

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I have this little problem to create a Binary Encoder Decimal with program WinbreadBoard. The image was related to what I got to do.

The problem is that I do not know how to put it in digital protoboard. This is different ICs or is one? All these keys .. WinBreadboard only has the ABCD (and their negations)
If a single IC, where IC is this? How do I find? I suspect that is a NAND (Not AND).

View attachment 64220

It was recommended the following ICs: 7400, 7420 and 7430. But for sure I'm doing something wrong, because the LED panels show the values ​​F and C, should be 0 and 0, since the bits are zero. \/

View attachment 64219

I wonder where I am wrong in this circuit.

Sorry, for my poor english.

Thanks for all.
 
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