def num2char(numpair, key):
    """Takes in a numpair like '34', and returns the character in row 3 (actually 4th row)
    and column 4 (actually 5th column) of the key"""
    row_num = int(numpair[0])
    column_num = int(numpair[1])
    return(key[row_num][column_num])