import math
test_a = "Hallo_Welt"
test_b = "Hell_Planet"

def slice(txt):
    l=len(txt)
    for i in range(1,l):
        if i<=l:
            print(f"{txt[:i+1]}   {round(i/2)}" )
        else:
            print(txt[i])



print(slice(test_a))