import numpy as np
from matplotlib import pyplot as plt
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
x = np.array([0, 2, 4, 6])
y = np.array([1, 3, 5, 7])
ticks = ['a', 'b', 'c', 'd']
plt.xticks(x, ticks)
plt.yticks(y, ticks)
plt.plot(x, y, c='green')
plt.margins(x=0, y=0)
plt.show()