Untitled

# a = list(input())
# b = list(input())
from collections import defaultdict

# a = list("CLOUD")
# b = list("CUPID")

# a = list("ALICE")
# b = list("ELIBO")

# a = "ABCBCYA"
# b = list("ZBBACAA")
#IPSSPIP
d = defaultdict(int)
passedB = defaultdict(list)
for i in range(len(a)):
    if a[i] == b[i]:
        b[i] = 'P'
    else:
        if len(passedB[a[i]]) > 0:
            b[passedB[a[i]].pop(0)] = 'S'
        else:
            d[a[i]] += 1

        if d[b[i]] > 0:
            d[b[i]] -= 1
            b[i] = 'S'
        else:
            passedB[b[i]].append(i)
            b[i] = 'I'


print(''.join(b))