python EOFERROR: EOF when reading in a line

I was just coding in Microsoft Visual Studio, and it didn't work, with a EOFERROR.

r=0
print('Welcome to Counting! ')
while(1==1):
    while(r>=0):
        if(r==0):
            print('Type "c" to show the Copyright, type "s" to start.')
            s=input() #The EOFERROR is here
            if(s==('c')):
                print('Copyright Fxxndxn. All Rights Reserved. ')
            elif(s==('s')):
                print('Start Now! ')
                r+=1
                x=input('Type your first number here: ') #I think here is also a error
                if x.isdigit():
                    z=input('Type your operator here: ') #Also here
                    y=input('Type your second number here: ') #And here
                    if y.isdigit():
                        p=eval(x+z+y)
                        print('result:',p)
                    else:
                        print('please start again. ')
                        continue
                else:
                    print('please start again. ')
                    continue
        elif(r>0):
            print('Type "c" to show the Copyright, type "s" to start, type "e" to exit. ')
            s=input() #Here
            if(s==('c')):
                print('Copyright Fxxndxn. All Rights Reserved. ')
            elif(s==('e')):
                break
            elif(s==('s')):
                print('Start Now! ')
                r+=1
                x=input('Type your first number here: ') #Here
                if x.isdigit():
                    z=input('Type your operator here: ')#Here
                    y=input('Type your second number here: ')#Here......
                    if y.isdigit():
                        p=eval(x+z+y)
                        print('result:',p)
                    else:
                        print('please start again. ')
                        continue
                else:
                    print('please start again. ')
                    continue
    print('Are you sure to leave? (Y/N) ')
    a=input()
    if(a==('y')):
        break
    elif(a==('n')):
        continue

The Error is: EOFERROR: EOF when reading a line

I don't know how to solve this error, so I have to ask you.

Help me with this error, please!

没有错啊。
看运行过程：
Welcome to Counting! 
Type "c" to show the Copyright, type "s" to start.
we
Type "c" to show the Copyright, type "s" to start.
c
Copyright Fxxndxn. All Rights Reserved. 
Type "c" to show the Copyright, type "s" to start.
s
Start Now! 
Type your first number here: 12
Type your operator here: +
Type your second number here: 34
result: 46
Type "c" to show the Copyright, type "s" to start, type "e" to exit.