#include <bits/stdc++.h>
namespace chtholly {
char buf[1 << 23], *p1 = buf, *p2 = buf;
inline int read() {
  int x = 0, f = 1;
  char c = getchar();
  for (; !isdigit(c); c = getchar()) f ^= c == '-';
  for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
  return f ? x : -x;
}
template <typename mitsuha>
inline bool read(mitsuha &x) {
  x = 0;
  int f = 1;
  char c = getchar();
  for (; !isdigit(c) && ~c; c = getchar()) f ^= c == '-';
  if (!~c) return 0;
  for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
  return x = f ? x : -x, 1;
}
template <typename mitsuha>
inline int write(mitsuha x) {
  if (!x) return 0 & putchar(48);
  if (x < 0) putchar('-'), x = -x;
  int bit[20], i, p = 0;
  for (; x; x /= 10) bit[++p] = x % 10;
  for (i = p; i; --i) putchar(bit[i] + 48);
  return 0;
}
inline char fuhao() {
  char c = getchar();
  for (; isspace(c); c = getchar())
    ;
  return c;
}
}  // namespace chtholly
using namespace chtholly;
using namespace std;
const int yuzu = 1e5, aoi = 1018;
int cl[2][aoi][aoi], id[aoi][aoi], ans[yuzu | 10];
void dfs(int p, int u, int v, int c1, int c2) {
  int t = cl[!p][v][c1];
  cl[p][u][c1] = v, cl[!p][v][c1] = u;
  if (!t) return void(cl[!p][v][c2] = 0);
  dfs(!p, v, t, c2, c1);
}
int main() {
  int n, m, k, i, u, v, j, llx = 0;
  read(n), read(m), read(k);
  for (i = 1; i <= k; ++i) {
    u = read(), v = read();
    id[u][v] = i;
    int c1 = 1, c2 = 1;
    for (; cl[0][u][c1]; ++c1)
      ;
    for (; cl[1][v][c2]; ++c2)
      ;
    llx = max(llx, max(c1, c2));
    if (c1 == c2)
      cl[0][u][c1] = v, cl[1][v][c2] = u;
    else
      dfs(0, u, v, c1, c2);
  }
  write(llx), puts("");
  for (i = 1; i <= n; ++i)
    for (j = 1; j <= llx; ++j)
      if (cl[0][i][j]) ans[id[i][cl[0][i][j]]] = j;
  for (i = 1; i <= k; ++i) write(ans[i]), putchar(' ');
}
