Monosyllabic dental stems of the third declension

Is the accusative singular of παῖς παίν or παῖδα? Mastronarde says that for disyllabic stems of third-declension dentals the accusative is the short form when accented on the first syllable and the longer form when accented on the second, but is silent on monosyllables.

Thanks.

παῖδα

If I’m not mistaken, all 3rd decl. monosyllabic consonantal stems (i.e., other than stems in -ι and -υ) have acc. sing. in -Cα. Monosyllabic 3rd decl. stems in -υ usually have accusatives in -υν (e.g., γραυν, βουν, ναυν, which are perispomenon). I’m not sure there are any monosyllabic stems in -ι, but if there are, I suspect the accusative would be -ιν.

Thanks.

ed: just letting you know I saw your edit