103

//103
#include <cstdio>
#define form(i, n) for (int i = 0; i < (n); ++ i)

int main(void) {
    FILE* fin = fopen("input.txt", "r");
    FILE* fout = fopen("output.txt", "w");

    int p = 0, k = 0, s = 0, l = 0, f = 0;
    char str[65];
    fscanf(fin, "%s", str);
    fclose(fin);
    for (int i = 0; str[i] != 0; ++ i) {
        if (str[i] == 'P') ++ p;
        else if (str[i] == 'K') ++ k;
        else if (str[i] == 'S') ++ s;
        else if (str[i] == 'L') ++ l;
        else if (str[i] == 'F') ++ f;
    }
    form(i, p) fprintf(fout, "P");
    form(i, k) fprintf(fout, "K");
    form(i, s) fprintf(fout, "S");
    form(i, l) fprintf(fout, "L");
    form(i, f) fprintf(fout, "F");
    fprintf(fout, "\n");
    fclose(fout);
    return 0;
}