A

a, b = input().split()
mpa = {}

for i in a:
    mpa[i] = 1

ans = ['0'] * len(a)

for i in range(len(a)):
    if a[i] == b[i]:
        mpa[a[i]] -= 1
        ans[i] = 'P'
for i in range(len(a)):
    if ans[i] != '0':
        continue
    if b[i] not in mpa: mpa[b[i]] = 0
    if mpa[b[i]] > 0:
        ans[i] = 'S'
        mpa[b[i]] -= 1
    else:
        ans[i] = 'I'

print(''.join(ans))