input_phrase = str(input())

total_acronym = ''

def main():
    print('Thank you have a wonderful day!')

for i in range(len(input_phrase)):
    if i == 0:
        if input_phrase[i].isupper():
            total_acronym += input_phrase[i] 
    elif input_phrase[i].isspace():
        if input_phrase[i+1].isupper():
            total_acronym += input_phrase[i+1] 

print(total_acronym)

if __name__ == '__main__:'
         main()

I just cannot figure out how to get it to loop ive been trying to figure this out for like 3 hours and im genuinly going insane