Answer
$(2,4)$ and $(2,-2)$.
Work Step by Step
If the transverse axis is parallel to the y-axis (as it can be seen on the figure), then the y-coordinates of the foci will be the same as the y-coordinate of the center. We can get the two foci's y-coordinates by adding and subtracting the given $a$-value from the centre's x-coordinate. Hence the 2 foci:
$(2,1+a)=(2,1+3)=(2,4)$ and $(2,1-a)=(2,1−3)=(2,−2)$
