20221006

# print('Hello')
# print('World')

# print('Hello', end=' ')
# print('World')

# print('Hello', 'World', 'Apple', 'Banana')
# print('Hello', 'World', 'Apple', 'Banana', sep='>>>')

# print(10 + 20)

# x = input()
# y = input()
# print(x, y)

# x, y = input().split()
# print(x, y)

# x, y = input().split()
#
# print(type(x))
# x = int(x)
# y = int(y)
# print(type(x))

# print(x + y)

# print('Hello')

# print('Hello','World')

# print('Hello \nWorld')

# print("'Hello'")

# print('"Hello World"')

# print('"!@#$%^&*()\'')

# import matplotlib.pyplot as plt

# print('"C:Download\'hello'.py"')

# print('print("Hello\\nWorld")')

# x= input()
# print(x)
# x = input()
# x=int(x)
# print(x)
# x = input()
# x=float(x)
# print(x)
# x=input()
# y=input()
# print(x)
# print(y)
# a=input()
# b=input()
# print(b)
# print(a)
# x=input()
# x=float(x)
# print(x)
# print(x)
# print(x)
# x, y = input().split()
#
# print(x)
# print(y)
# a, b = input().split()
#
# print(b, a)
# x=input()
# print(x,x,x)
# a, b = input().split(':')
# print(a,b,sep=':')
# a,b,c=input().split('.')
# print(c,b,a,sep='-')
# a,b=input().split('-')
# print(a,b, sep='')
# a,b,c,d,e=input()
# print(a)
# print(b)
# print(c)
# print(d)
# print(e)
#
# x = input()
#
# year = x[0:2]
# print(year, end=' ')
# month = x[2:4]
# print(month, end=' ')
# day = x[4:6]
#  print(day)
# x,y,z=input().split(':')
# hour = x
# minute = y
# second = z
# print(minute)
# x,y=input().split(' ')
# print(x+y)
x,y=input().split(' -')
print(x -y)