input = "3113322113"
#input = "21"

loop = 0
while loop < 50:
    index = 0
    new_input = ""
    #print("Input: " + input)
    while index != len(input):
        #print("\t Index: " + str(index))
        char_count = 1
        char = input[index]
        #print("\t Char: " + char)
        for i in range(index+1, len(input)):
            #print("\t\t I: " + str(i))
            #print("\t\t Input[i]:" + input[i])
            if input[i] == char:
                char_count += 1
                #print("\t\t\tMatch found")
            else:
                #print("\t\t\tBreak")
                break;
        #print("\t Char Count: " + str(char_count))
        #print("\t There is " + str(char_count) + " number " + char)
        new_input += str(char_count)
        new_input += str(char)
        index += char_count
    #print("New Input: " + new_input)
    input = new_input
    loop += 1

#print(input)
print(len(input))