from string import *

def subStringMatchExact(target, key):
    x = 0
    z = []
    for y in range(len(key)):
        findit = find(target, key[y],x)
        while findit != -1:
            z.append(findit)
            x = findit+1
            findit = find(target, key[y],x)
    return tuple(z)
        

print subStringMatchExact("SUCCESS","SU")

(0, 5, 6)