convert string>>dictionary >>list >> string
input_new=list(string2)
sort_list=input_new.sort()
d={x:input_new.count(x) for x in input_new}
l=[]
for key, value in d.items():
l.append(key)
l.append(str(value))
print(''.join(l))
input_new=list(string2)
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