Hello all, I am trying to do something simple, although my explanation may seem complicated.

2 input cells and 1 output cell.
input cells will hold 2 unique single digit numbers.
output cell to add both output cells together. I then want the output cell to add the 2 digits together and give me the final one digit number.

example 1:
Step one: 2 + 9 = 11
Step two: 1 + 1 = 2 (final output)

example 2:
Step one: 9 + 6 = 15
Step two: 1 + 5 = 6 (final output)

any gurus able to enlighten me on this please? TIA!