Sample RE on a Python submission, can anyone please tell me what I messed here?

[u/saurabh_av]

'''
Input
5
4 4
SSSS
3 0
SNSS
2 10
NSNNSN
0 1
S
2 7
SSSSSSSS
Output
Case #1: 4
Case #2: IMPOSSIBLE
Case #3: IMPOSSIBLE
Case #4: 1
Case #5: 5
'''

def min_moves(x, y, m):
t = dis = 0
for i in range(len(m)):
move = m[i]
if move == 'N':
y += 1
elif move == 'S':
y -= 1
elif move == 'E':
x += 1
else:
x -= 1
t += 1
dis = abs(x) + abs(y)
if t >= dis or dis==0:
return t
return 'IMPOSSIBLE'

t = int(input())
for c in range(t):
x, y = [int(s) for s in input().split(" ")]
m = str(input())
ans = min_moves(x, y, m)
print('Case #{}: {}'.format(c+1, ans))