Find non-negative integers $a, b, c, d$ such that $5^a + 6^b + 7^c + 11^d = 1999$.	
1. We start by noting the bounds for the powers of 5, 6, 7, and 11:
   \[
   5^4 < 1999 < 5^5, \quad 6^4 < 1999 < 6^5, \quad 7^3 < 1999 < 7^4, \quad 11^3 < 1999 < 11^4
   \]
   This helps us understand the possible ranges for \(a, b, c,\) and \(d\).

2. Next, we use modulo 5 to simplify the equation:
   \[
   5^a + 6^b + 7^c + 11^d \equiv 1999 \pmod{5}
   \]
   Since \(5^a \equiv 0 \pmod{5}\) for any \(a \geq 1\), we have:
   \[
   6^b \equiv 1 \pmod{5}, \quad 7^c \equiv 2 \pmod{5}, \quad 11^d \equiv 4 \pmod{5}
   \]
   This simplifies to:
   \[
   0 + 1 + 2 + 4 \equiv 7 \equiv 2 \pmod{5}
   \]
   Therefore, \(7^c \equiv 2 \pmod{5}\) implies \(c = 1\).

3. Substituting \(c = 1\) into the original equation, we get:
   \[
   5^a + 6^b + 11^d = 1999 - 7 = 1992
   \]

4. Now, we use modulo 11 to further simplify:
   \[
   5^a + 6^b + 11^d \equiv 1992 \pmod{11}
   \]
   Since \(11^d \equiv 0 \pmod{11}\) for any \(d \geq 1\), we have:
   \[
   5^a + 6^b \equiv 1992 \pmod{11}
   \]
   Simplifying \(1992 \pmod{11}\):
   \[
   1992 \div 11 = 181 \text{ remainder } 1 \implies 1992 \equiv 1 \pmod{11}
   \]
   Therefore:
   \[
   5^a + 6^b \equiv 1 \pmod{11}
   \]

5. We now find the values of \(a\) and \(b\) that satisfy this congruence. We calculate the powers of 5 and 6 modulo 11:
   \[
   5^1 \equiv 5 \pmod{11}, \quad 5^2 \equiv 3 \pmod{11}, \quad 5^3 \equiv 4 \pmod{11}, \quad 5^4 \equiv 9 \pmod{11}
   \]
   \[
   6^1 \equiv 6 \pmod{11}, \quad 6^2 \equiv 3 \pmod{11}, \quad 6^3 \equiv 7 \pmod{11}, \quad 6^4 \equiv 9 \pmod{11}
   \]

6. We check the possible pairs \((a, b)\) that satisfy \(5^a + 6^b \equiv 1 \pmod{11}\):
   - For \((a, b) = (1, 3)\):
     \[
     5^1 + 6^3 \equiv 5 + 7 \equiv 12 \equiv 1 \pmod{11}
     \]
     This pair works. We then check:
     \[
     5^1 + 6^3 + 11^d = 5 + 216 + 11^d = 1992 \implies 11^d = 1771 \quad \text{(not possible since 1771 is not a power of 11)}
     \]

   - For \((a, b) = (2, 4)\):
     \[
     5^2 + 6^4 \equiv 3 + 9 \equiv 12 \equiv 1 \pmod{11}
     \]
     This pair works. We then check:
     \[
     5^2 + 6^4 + 11^d = 25 + 1296 + 11^d = 1992 \implies 11^d = 671 \quad \text{(not possible since 671 is not a power of 11)}
     \]

   - For \((a, b) = (4, 2)\):
     \[
     5^4 + 6^2 \equiv 9 + 3 \equiv 12 \equiv 1 \pmod{11}
     \]
     This pair works. We then check:
     \[
     5^4 + 6^2 + 11^d = 625 + 36 + 11^d = 1992 \implies 11^d = 1331 \implies d = 3
     \]

7. Therefore, the only solution is:
   \[
   (a, b, c, d) = (4, 2, 1, 3)
   \]

The final answer is \(\boxed{(a, b, c, d) = (4, 2, 1, 3)}\).