def senar_senar(s1, s2):
    n1=len(s1)//2
    tros1=s1[:n1]
    n2=len(s2)//2
    tros2=s2[n2+1:]
    paraula =tros1+tros2
    paraula=paraula.replace('#', 'a')
    paraula=paraula.replace('&', 'e')
    paraula = paraula[1:-1]
    return paraula





def informacio(s1, s2):

    if len(s1)%2==1 and len(s2)%2==1:

        paraula = senar_senar(s1, s2)
    elif len(s1)%2==0 and len(s2)%2==1:
        
        paraula = senar_senar(s1[:-1], s2)
        
    elif len(s1)%2==1 and len(s2)%2==0:
        paraula = senar_senar(s1, s2[:-1])
    else:
        tros1=s1[::2]
        tros2=s2[1::2]
        paraula = tros1+tros2
    return paraula