@[toc]

正文

import sys
import math

# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.

s = input()
news=""

for c in s:
    if c.isalpha() or c==" ":
        news+=c
print(news)

import sys
import math

# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.

x = int(input())
y = int(input())

print(x*(x+y))

import sys
import math

# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.

n = int(input())

print(n**2)

import sys
import math

# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.

_input = input()


print(len(_input),_input[::-1])

import sys
import math

# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.

n = int(input())

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n-1)
    
print(factorial(n))

import sys
import math

# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.

a = int(input())

# Write an answer using print
# To debug: print("Debug messages...", file=sys.stderr, flush=True)

print(a*a-a)

写在最后

欢迎技术类的问题到这里提出，我会逐个解答

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