def rle(str):
    z=""
    for i in str:
        if i in z:
            print("")
        else:
            z=z+i
    for i in z:
        ch=""
        c=0
        k=0
        while k<len(str):
            if i == str[k]:
                c=c+1
            k=k+1
        print(c, i, end=" ")
    return(ch)