#include <stdio.h>

#define N 1000000

int main() {

static int hole[N];

int n, m, k, i, j;

scanf(“%d%d%d”, &n, &m, &k);

for (j = 0; j < m; j++) {

scanf(“%d”, &i);

i–;

hole[i] = 1;

}

i = 0;

while (k– > 0) {

int u, v, tmp;

scanf(“%d%d”, &u, &v);

u–, v–;

if (u == i || v == i) {

if (u == i)

tmp = u, u = v, v = tmp;

if (!hole[i])

i = u;

}

}

printf(“%d\n”, i + 1);

return 0;

}