from keras import layers
from keras import models

model = models.Sequential()
model.add(layers.Conv2D(32, kernel_size = (3,3), activation='relu', input_shape=(28,28,1)))
model.add(layers.MaxPooling2D((2,2)))
model.add(layers.Conv2D(64, kernel_size=(3,3), activation='relu'))
model.add(layers.MaxPooling2D((2,2)))
model.add(layers.Conv2D(64, kernel_size=(3,3), activation='relu'))