In one embodiment, a method includes providing for display a first set of touch-screen keys corresponding to a first set of symbols; providing for display, at least partially underneath the first set of touch-screen keys the first set of touch-screen keys, a second set of touch-screen keys corresponding to a second set of symbols; detecting a touch gesture by a user over the first and second sets of keys intending to input a first symbol; determining, based on an amount of lapsed time between the detected touch gesture and a previous touch gesture, a context associated with the detected touch gesture; and selecting, based at least in part on the context, a symbol in the first set of symbols or a symbol in the second set of symbols as the first symbol that the user intended to input.