def decToOctal(decimal):#פונקציה להפיכת מספר עשרוני למספר אוקטלי
    octal = 0
    ctr = 0
    temp = decimal  # copying number
    # computing octal using while loop
    while (temp > 0):
        octal += ((temp % 8) * (10 ** ctr))  # Stacking remainders
        temp = int(temp / 8)  # updating dividend
        ctr += 1
    return octal

def OctalToDecimal(num):  #פונקציה להפיכת מספר אוקטלי למספר עשרוני
    decimal = 0
    base = 1  #Initializing base value to 1, i.e 8^0
    while (num):
        # Extracting last digit
        last_digit = num % 10
        num = int(num / 10)
        decimal += last_digit * base
        base = base * 8
    return decimal

def numbers_methods():
    DecimalList =[]
    OctalList = []
    sum=0
    for i in range(3):
        number = int(input("enter a octal number"))
        DecimalList.append(OctalToDecimal(number))
        OctalList.append(number)
        sum += OctalToDecimal(number)
    print("the octal numbers is: ", OctalList)
    print("the decimal numbers is : ", DecimalList)

    print("the sum of decimal number is : ",sum," --- in Octal is: ",decToOctal(sum))

def summer(list1):
    mystring=""
    newList = []
    for i in range(len(list1)):
        if(type(list1[i]) == int or type(list1[i]) == float):#בדיקה
            return sum(list1)
        elif(type(list1[i]) == bool):
            return (sum(list1))
        elif(type(list1[i]) == str):
            mystring += list1[i]
        elif(type(list1) == list):
            newList = list1
            return newList
    return mystring
def main():
    #numbers_methods()
    print(summer([10,11,12,0.75]))
    print(summer([True,False,True,True]))
    print(summer(['aa','bb','cc']))
    print(summer([[1,2,3,'a'],['a','b','c',4]]))
main()