#include <bits/stdc++.h>
using namespace std;

// pp basics

#define in ,
#define esc_paren(...) __VA_ARGS__
#define pp_empty(...)
#define pp_cat_i(x, y) x ## y
#define pp_cat(x, y) pp_cat_i(x, y)

#define pp_inc0 1
#define pp_inc1 2
#define pp_inc2 3
#define pp_inc3 4
#define pp_inc4 5
#define pp_inc5 6
#define pp_inc6 7
#define pp_inc7 8
#define pp_inc8 9
#define pp_inc(i) pp_cat(pp_inc, i)

// pp args counter

#define def_pp_comma0 ,1
#define pp_comma0 ,0
#define pp_is_empty(x, ...) pp_is_empty1(x pp_comma0)
#define pp_is_empty1(x) pp_is_empty2((def_ ## x))
#define pp_is_empty2(t) pp_is_empty3 t
#define pp_is_empty3(f, s) s

#define pp_is_one(...) pp_is_one_(__VA_ARGS__, pp_one_seq)
#define pp_is_one_(...) pp_is_one_n(__VA_ARGS__)
#define pp_is_one_n(_1,_2,_3,_4,_5,_6,_7,_8,_9,_10, N, ...) N
#define pp_one_seq 0,0,0,0,0,0,0,0,0,1,0

#define pp_narg(...) \
         pp_narg_(__VA_ARGS__, pp_narg_seq)
#define pp_narg_(...) \
         pp_arg_n(__VA_ARGS__)
#define pp_narg_n( \
          _1, _2, _3, _4, _5, _6, _7, _8, _9,_10, \
         _11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
         _21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
         _31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
         _41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
         _51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
         _61,_62,_63,n,...) n
#define pp_narg_seq \
         63,62,61,60, \
         59,58,57,56,55,54,53,52,51,50, \
         49,48,47,46,45,44,43,42,41,40, \
         39,38,37,36,35,34,33,32,31,30, \
         29,28,27,26,25,24,23,22,21,20, \
         19,18,17,16,15,14,13,12,11,10, \
          9, 8, 7, 6, 5, 4, 3, 2, 1, 0

// pp if
#define pp_if_0(x, y) y
#define pp_if_1(x, y) x
#define pp_if(cond, x, y) pp_cat(pp_if_, cond)(x, y)

// pp foreach
#define pp_foreach_i9(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i8(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i7(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i6(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i5(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i4(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i3(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i2(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i1(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i0(i, f, x, ...) f(x) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach_i(i, f, ...) pp_if(pp_is_empty(__VA_ARGS__), pp_empty, pp_cat(pp_foreach_i, i))(pp_inc(i), f, __VA_ARGS__)
#define pp_foreach(f, ...) pp_foreach_i(0, f, __VA_ARGS__)

// alternative rep macro
#define rep(...) rep1(rep2, (__VA_ARGS__))
#define rep1(X, A) X A
#define rep2(i, ...) pp_if(pp_is_one(__VA_ARGS__), rep_len1(i, __VA_ARGS__), rep3(i, __VA_ARGS__))
#define rep_len1(i, end, ...) for (int i = 0; i < end; i++)
#define rep3(i, iter, ...) rep4(rep5, (iter, i, esc_paren __VA_ARGS__))
#define rep4(X, A) X A
#define rep5(iter, ...) iter(__VA_ARGS__)

// iterators
#define up up_iter ,
#define up_iter3(i, start, end) for (int i = start; i < end; i++)
#define up_iter4(i, start, end, up) for (int i = start; i < end; i += up)
#define up_iter(...) CAT(up_iter, PP_NARG(__VA_ARGS__))(__VA_ARGS__)
#define down down_iter ,
#define down_iter2(i, end) for(int i = end-1; i >= 0; i++)
#define down_iter3(i, start, end) for (int i = end-1; i >= start; i--)
#define down_iter4(i, start, end, down) for (int i = end-1; i >= start; i -= down)
#define down_iter(...) CAT(down_iter, PP_NARG(__VA_ARGS__))(__VA_ARGS__)
#define viter viter_iter ,
#define viter_iter(i, v) auto tmpitr=v.begin(); for (auto i=*tmpitr; tmpitr != v.end(); tmpitr++)

// debug macros
#define debug_var_elem(v) << #v << "=" << v << " "
#ifdef DEBUG
#define debug_echo(e) cout << "L" << __LINE__ << ": " << e << endl
#define debug_var(...) cout << "L" << __LINE__ << ": " pp_foreach(debug_var_elem, __VA_ARGS__) << endl
#else
#define debug_echo(e)
#define debug_var(...)
#endif

// short names
typedef long long ll;
typedef string str;
#define down_queue(x) priority_queue<x>
#define up_queue(x) priority_queue<x, vector<x>, greater<x>>
#define vec(x) vector<x>
ll gcd(ll a,ll b){while(b){ll tmp = a % b;a = b;b = tmp;}return a;}
ll lcm(ll a,ll b){return a / gcd(a,b) * b;}
#define all(x) x.begin(), x.end()
#define split_str(str, sp_word) istringstream stream(str); string res; for(int cnt = 0; getline(stream,res,sp_word); cnt++)
#define digit(x) ((int)log10((double)(x)) + 1)
#define mp(x,y) make_pair(x,y)
#define pb(x) push_back(x)
#define pf(x) push_front(x)
#define out(x) for(auto i : x) cout << i << " "; cout << endl;
#define outln(x) for(auto i : x) cout << i << " " << endl;
#define vec_cpy(to,from) copy(all(to),back_inserter(from))
#define ary_cpy(to,from) memcpy(to, from, sizeof(from))
#define MOD = 1000000007; 

//
// Implementation
//

#define MAX_N 100000
#define MAX_M 100000
#define MAX_K 200000

int N;
int M;
int K;

struct Member {
  int par;
  int club;
};

Member par[MAX_N+1];
int ufrank[MAX_N+1];

void init(int n) {
  rep (i in n) {
    par[i] = Member{i, -1};
    ufrank[i] = 0;
  }
}

Member find(int x) {
  if (par[x].par == x) {
    return par[x];
  } else {
    return par[x] = find(par[x].par);
  }
}
Member find_set(int x, int club) {
  if (par[x].par == x) {
    par[x].club = club;
    return par[x];
  } else {
    return par[x] = find_set(par[x].par, club);
  }
}

bool unite(int x, int y) {
  x = find(x).par;
  y = find(y).par;
  if (x == y) return true;

  if (ufrank[x] < ufrank[y]) {
    if (par[x].club == -1) {
      find_set(x, find(y).club);
    } else if (par[y].club == -1) {
      find_set(y, find(x).club);
    } else if (par[x].club != par[y].club) {
      return false;
    }
    par[x].par = y;
    return true;
  } else {
    if (par[x].club == -1) {
      find_set(x, find(y).club);
    } else if (par[y].club == -1) {
      find_set(y, find(x).club);
    } else if (par[x].club != par[y].club) {
      return false;
    }
    par[y].par = x;
    if (ufrank[x] == ufrank[y]) ufrank[x]++;
    return true;
  }
}

bool same(int x, int y) {
  return find(x).par == find(y).par;
}

int main() {
  cin >> N >> M >> K;
  init(N);
  rep (i in K) {
    int t; cin >> t;
    int a, b; cin >> a >> b;
    if (t == 1) {
      if (!unite(a, b)) {
        cout << i+1 << endl;
        return 0;
      }
    } else {
      int aclub = find(a).club;
      if (aclub == -1 || aclub == b) {
        find_set(a, b);
      } else if (aclub != b) {
        cout << i+1 << endl;
        return 0;
      }
    }
  }
  cout << 0 << endl;
}

Measured memory_bytes: 4240