Can anyone figure out why my loop counter isn't working during my while statement (Itterating) . Loop should equal nine when running

Can anyone figure out why my loop counter isn't working during my while statement (Iterating) . Loop should equal nine when running . I Also should see skipping - 5 when running because it is less than 0

values = [ 3, 53, 19, -5, 60, 41, "test", 5, 2, 9, 22]

#create a loop using a for or while

for i in values:

    # Use one or more if-elif-else conditional statements within the loop

    if i == 9:
      # Use a break statement
      break
    elif isinstance(i, str):
      # Use a continue statement
      continue
    else:
      print(i)

while loop example

total = 0
loop = 0
while total < 200:
   if isinstance(values[loop], str):
       loop +-1
       continue
   elif values[loop] > 0:
       total += values[loop]
   else:
    print(f'skipping {values[loop]}')

    if loop == len(values)-1:
      break
    loop += 1

print(f'sum: {total}, loop: {loop}')

Terminal After Running Code

3
53
19
-5
60
41
5
2
sum: 201, loop: 0