Python Challenges Program

Challenges program: program 1: #Input :ABAABBCA #Output: A4B3C1 str1="ABAABBCA" str2="" d={} for x in str1: d[x]=d.get(x,0)+1 print(d) for k,v in d.items(): str2+=k+str(v) print(str2) Output: {'A': 4, 'B': 3, 'C': 1} A4B3C1 program 2: #Input :a4b3c2 #Output: aaaabbbcc str1="a4b3c2" str2="" for ch in str1: if ch.isalpha(): x=ch else: d=int(ch) str2=str2+x*d print(str2) output: aaaabbbcc program 3: #Reverse the middle words #Input :Hi how are you python #Output: Hi woh era uoy python str1="Hi how are you python" list1=[x for x in str1.split(" ")] print(list1[0],end=" ") for i in range(1,len(list1)-1): print(list1[i][::-1],end=" ") print(list1[len(list1)-1]) Output: Hi woh era uoy python program 4: #Input :B4A1D3 #Output: ABD134 str1="B4A1D3" alphabet=[] digit=[] for x in str1: if x.isalpha(): alphabet.append(x) else: digit.append(x) result=(sorted(alphabet)+sorted(digit)) print("".join(result)) Output: ABD134 program 5: #Input :aaaabbbccz #Output: 4a3b2c1z str1="aaaabbbccz" str2="" n=len(str1) previous=str1[0] count=1 i=1 while i