def find_longest_repeating_character(s):
count = 1
max_repeating_count = 0
prev_ch = None
max_ch = None
for ch in s:
if ch == prev_ch:
count += 1
if (count > max_repeating_count):
max_repeating_count = count
max_ch = ch
else:
count = 1
prev_ch = ch
return max_ch
s = "hhaabbbbhhhhhhhdddefhhhgggg88"
print(find_longest_repeating_character(s))
'''
run:
h
'''