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with open('data.txt', 'r') as f:
s = f.readlines()
dict1 = {}
for sj in s:
sj = str(sj.strip())
for i in sj:
if dict1.get(i,0):
dict1[i] += 1
else:
dict1[i] = 1
dict1 = sorted(dict1.items(), key=lambda x:x[0])
for key,value in dict1:
print("{}:{}".format(key,value))