You will enter zero. When you recharacterize a contribution, the original treatment of the contribution is treated as if it never happened. Even though you recharacterized in 2017, your original contribution (which is now a nondeductible Traditional IRA) was made in 2016. You are considered to have made your Traditional IRA contribution in 2016 and not 2017. Here is an FAQ with more information: https://ttlc.intuit.com/replies/3302139
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