698 B | 698 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
while 1:
l = mii()
if len(l) == 1:
break
n, *l = l
s = sum(l)
k = 0
for idx in range(n):
k += l[idx]
if k * 2 == s:
print(f"Sam stops at position {idx + 1} and Ella stops at position {idx + 2}.")
break
else:
print("No equal partitioning.")
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()